Recently in The Universe Category

"'This is a major milestone on the road to finding Earth's twin,' said Douglas Hudgins, a scientist with the Kepler program...Kepler-22b, located about 600 light years away, has a radius 2.4 times bigger than the Earth, making it the smallest planet ever found in the middle of the habitable zone around a star." Among the several fascinating announcements in astronomy in recent weeks (including Hubble passing the 10,000th mission mark), scientists announce the discovery of a faraway habitable planet, Kepler-22b. "Scientists don't yet know whether it is a rocky, gaseous or liquid-covered planet." But, don't worry -- the Air Force has top men looking into the situation. Top...men.

Moreover, just today scientists announced the discovery of two Earth-sized planets -- Kepler 20e and Kepler 20f. "'For the first time, we've crossed the threshold of finding Earth-size worlds,' Torres says. 'The next step is having an Earth-size planet in the habitable zone.'" And apparently Kepler 20f may have once had water, not unlike a planet closer to home...

"This is the single most bullet-proof observation that I can think of that we've made this entire mission regarding the liquid water." Something to consider if we don't manage to tackle global warming by 2006 -- the prior existence of water on Mars is further confirmed through a trail of gypsum left within an ancient rock. "Both the chemistry and the structure 'just scream water,' Squyres added."

And, on a grander scale, astronomers have begun to uncover supermassive black holes (no, not those ones) at the centers of galaxies. These are "the biggest, baddest black holes yet found in the universe, abyssal yawns 10 times the size of our solar system into which billions of Suns have vanished like a guilty thought." In other words, plenty of room for Maximillian Schell to get lost in there...Tread carefully.

"A dazzling green aurora frames the arc of the Milky Way over Jökulsárlón, the largest glacier lake in Iceland, in a picture taken in March. The image was a first-prize winner in the Second International Earth and Sky Photo Contest's 'Beauty of the Night Sky' category." Speaking of green lights, National Geographic chooses the top space photos of 2011.

"'We tried to find all possible explanations for this,' the report's author Antonio Ereditato of the Opera collaboration told BBC News on Thursday evening. 'We wanted to find a mistake - trivial mistakes, more complicated mistakes, or nasty effects - and we didn't. When you don't find anything, then you say "well, now I'm forced to go out and ask the community to scrutinise this".'"

As broke everywhere last week, CERN appears to find evidence of neutrinos moving faster than light(!) -- time travel possible which would, well, basically rewrite the laws of physics and make. (See what I did there? Anyway, kind of a big deal!)

Fermilab is currently trying to reproduce the results, but for now, the scientific community is, shall we say, skeptical. "Extraordinary claims require extraordinary evidence. I think it will be perceived in retrospect as an embarrassment that this claim received so much publicity--the inevitable consequence of posting a preprint on the Web."

Update: Sorry, aspiring Marty McFlys: As expected, rumors of relativity's demise have been greatly exaggerated. Here's the rub: "[T]he distance that the neutrinos had to travel in their reference frame is longer than the distance that the neutrinos had to travel in our reference frame, because in our reference frame, the detector was moving towards the source." Thus, thte experiment "helps to reinforce relativity rather than question it."

"In a teleconference, Kaltenegger said that the planet is at the warm edge of its star's habitable zone, as if 'standing next to a bonfire.' That means the planet would require a lot of cloud cover -- which reflects starlight -- to keep the surface cool enough to prevent any water from boiling, she said."

Gliese 581g, meet HD85512b. Among the 50 new planets astronomers announced on Monday is a "Super-Earth" that lies within the inhabitable zone and could hold water. "The new super-Earth is 3.5 times the mass of Earth."

And, how are we going to get there, you ask? While DARPA works its mojo, NASA announces its most recent plans for a successor to the Shuttle: A new Space Launch System. "Administration officials said the new rocket system...would be the most formidable launch system deployed since the Saturn V...The new rocket coupled with a deep-space crew capsule already under development should enable an un-crewed test flight of the exploration system in 2017 and a crewed test flight by 2021, officials said." If history is any guide, you'll probably want to tack a few years on to those dates.

While we wait, here's another interesting cosmic find to ponder: Astronomers have found an honest-to-goodness twin-sunned Tatooine in Kepler 16b, 200 light years away. "'This is an example of another planetary system, a completely different type that no one's ever seen before,' Doyle said. 'That's why people are making a big deal out of this.'"

"Look back 100 years. If you could have had James Clerk Maxwell and Guglielmo Marconi and Albert Einstein sit around a lunch table in the early 1900s, they would have had all the math necessary to create an iPhone. But there's nothing that they could have done to characterize the integrated circuits, the satellites, the communication links or the Internet, to draw a plan that would have led them to an iPhone until Apple introduced it 100 years later. That's how I see where we are with this."

From the folks who brought you the Internet, DARPA announces the 100-Year Starship Study, offering $500,000 in seed money to whomever comes up with the best plan for developing the technology needed for interstellar travel. "To stimulate discussion on the research possibilities, DARPA officials will hold a symposium that brings together astrophysicists, engineers and even sci-fi writers so they can brainstorm what it would take to make this starship enterprise a success."

"'We're not completely out of the woods yet, but everybody's smiling here,' the institute's chief executive officer, Tom Pierson, told me today." Also in good space exploration news, SETI's Allen Telescope Array is now back online thanks to a wave of private donations. "Among the contributors are Jodie Foster...science-fiction writer Larry Niven...and Apollo 8 astronaut Bill Anders...'It is absolutely irresponsible of the human race not to be searching for evidence of extraterrestrial intelligence,' Anders wrote in a note accompanying his contribution."

"'We think there are only about 100 bright quasars with redshift higher than 7 over the whole sky,' concludes Daniel Mortlock, the leading author of the paper. 'Finding this object required a painstaking search, but it was worth the effort to be able to unravel some of the mysteries of the early Universe.'"

European astronomers find the farthest quasar yet discovered, 12.9 billion light years away and dating to only 770 million years after the Big Bang. "This brilliant beacon, powered by a black hole with a mass two billion times that of the Sun, is by far the brightest object yet discovered in the early Universe."

"So what makes the astronomers think these are free-floating planets, and not ones orbiting stars like Earth does? Well, the lensing events themselves show only a single rise and fall of the background starlight. If the planets were orbiting stars, those stars would also act like lenses, and their effect would be seen. They weren't."

As explained by Discover's Phil Plait, a NASA-funded study using gravitational lensing finds possible evidence of billions of rogue planets wandering the cosmos between the stars. "In fact, these free-floaters may outnumber 'regular' planets by a factor of 1.5 or so. There are more of them than there are of us!...It's thoughts that like which make me glad to be an astronomer, especially one living now. Just when you think the Universe is running low on surprises, it reminds us it's a lot more clever than we are."

"The ALPHA team want to keep antimatter intact long enough to study it, so last year they worked out how to hold a cloud of antihydrogen in a magnetic trap. Not for long, though: collisions with trace gases would have either annihilated the anti-atoms or given them the energy to escape, so the team opened the trap after 170 milliseconds and observed the resulting annihilations, verifying that antimatter had been made."

Building on the LHC's success last November, scientists in Geneva, Switzerland manage to trap anti-matter for a full sixteen minutes, 10,000 times longer than ever before. "This time around, they used the same method but also cooled the antiprotons used to create the antihydrogen, which lowered the energy of the antimatter,but increased the chance that more could be collected."

"'This is an epic result,' adds Clifford Will of Washington University in St. Louis...'One day,' he predicts, 'this will be written up in textbooks as one of the classic experiments in the history of physics.'"

Using "the most perfect spheres ever made by humans," a NASA experiment known as Gravity Probe B finds evidence of space-time curvature, as Einstein predicted under general relativity. "Everitt recalls some advice given to him by his thesis advisor and Nobel Laureate Patrick M.S. Blackett: 'If you can't think of what physics to do next, invent some new technology, and it will lead to new physics. Well,' says Everitt, 'we invented 13 new technologies for Gravity Probe B. Who knows where they will take us?'"

"'The fact that we've found so many planet candidates in such a tiny fraction of the sky suggests there are countless planets orbiting sun-like stars in our galaxy,' said William Borucki of NASA's Ames Research Center in Moffett Field, Calif., the mission's science principal investigator. 'We went from zero to 68 Earth-sized planet candidates and zero to 54 candidates in the habitable zone, some of which could have moons with liquid water.'"

After its initial sweep of 1/400th of the sky, NASA's Kepler telescope finds over 1200 planets -- 54 of them potentially inhabitable. (The picture above is a rendering of the six-planet Kepler-11 system, 2000 light-years away.)

Discover's Phil Plait puts today's findings in proper perspective: "Mind you, Kepler is only looking at a sample of stars that is one one-millionth of all the stars in the Milky Way. So it's not totally silly to take these numbers and multiply them by a million to estimate how many planets there may be in the galaxy...70 million Earth-size planets, and a million in the habitable zone of their stars. A frakking million. In our galaxy alone."

"It is a smudge of light only a tiny fraction of the size of our own Milky Way galaxy, and it existed when the universe was only 480 million years old...If confirmed, the discovery takes astronomers deep into an era when stars and galaxies were first lighting up the universe and burning their way out of a primordial fog known as the dark ages."

From a few days ago: The Hubble -- also the subject of an excellent IMAX-3D movie I saw on Saturday -- (probably) finds the oldest, farthest galaxy yet discovered. "Spectroscopic observations with the forthcoming James Webb Space Telescope, however, are needed to cement the identification of the smudge as a galaxy...The Webb telescope, which is expected to be launched later this decade once NASA figures out how to pay for it, has been designed to find these primordial galaxies and thus illuminate the dark ages."

"We may have to abandon this notion of using the Milky Way as a template for the rest of the universe," Dr. van Dokkum said. If the findings are correct, an undercount of dwarfs would mean astronomers have underestimated the masses of galaxies, and that would mean that galaxies developed earlier and faster than currently thought."

Another big happening on the astrobiology front. As first seen at Dangerous Meta, a joint Harvard-Yale study published in Nature finds that our universe may have three times as many stars as we thought. "That suggests a universe of roughly 100 sextillion stars, with an approximate margin of error of about 10 times fewer or 10 times more."

"'What we'd like to do is see if there's some difference that we don't understand yet between matter and antimatter," Professor Hangst said. 'That difference may be more fundamental; that may have to do with very high-energy things that happened at the beginning of the universe. That's why holding on to them is so important - we need time to study them.'"

Scientists at the Large Hadron Collider in Cern have found a way to hold atoms of antimatter for a fraction of a second. "[T]he ability to study such antimatter atoms will allow previously impossible tests of fundamental tenets of physics....'[W]e need a lot more atoms and a lot longer times before it's really useful - but one has to crawl before you sprint.'"

"In his proposal, time and space can be converted into one another, with a varying speed of light as the conversion factor. Mass and length are also interchangeable, with the conversion factor depending on both a varying gravitational "constant" and a varying speed of light (G/c2). Basically, as the universe expands, time is converted into space, and mass is converted into length. As the universe contracts, the opposite occurs."

By way of cdogzilla, PhysOrg's Lisa Zyga describes a new cosmological theory by Wun-Yi Shu of Taiwan that, among other things,does away with the Big Bang. "Essentially, this work is a novel theory about how the magnitudes of the three basic physical dimensions, mass, time, and length, are converted into each other...The theory resolves problems in cosmology, such as those of the big bang, dark energy, and flatness, in one fell stroke."

"If DAMA's signal were due to dark matter, Xenon 100 would have seen dozens of events -- unless the properties of dark matter are very different than expected, says Lang. 'If DAMA really does see dark matter, it has to be something very, very exotic, something much different from what we expect, so it's getting a bit unlikely.'" A new study casts doubt on apparent discoveries of dark matter particles by the DAMA experiment. Back to MOND, then?

"'We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet.'" As seen all over the place of late, Stephen Hawking warns of the perils of First Contact. "He concludes that trying to make contact with alien races is 'a little too risky'. He said: 'If aliens ever visit us, I think the outcome would be much as when Christopher Columbus first landed in America, which didn't turn out very well for the Native Americans.'" Hey, don't blame me. I voted for Kodos. (FWIW, many astrobiologists disagree.)

"Nature and Nature's laws lay hid in night: God said, Let Newton be! and all was light." Let's not forget Hubble too: As of today, Humankind's first great orbital telescope turns 20. And to think we're only at the beginning... [Greatest hits | A brief history of orbiting observatories | what's next.]

"In April, the world will celebrate the quinquagenary of SETI, the search for extraterrestrial intelligence, so it seems a good time to take stock of the silence. Three new books tackle the issue in three different ways. One, an immensely readable investigation of the SETI enterprise (with a surprising conclusion); the second, a technical guide to what we should be looking for and how; and the third, a left-field argument that the alien question has already been answered."

In New Scientist, Michael Hanlon surveys three new books about the continuing search for alien life, and attempts to grapple with the Fermi paradox."Today it is rare to meet an astronomer who doesn't believe that the universe is teeming with life. There is a feeling in the air that light will soon be shed on some of science's most fundamental questions: is Earth's biosphere unique? Do other minds ponder the universe?"

"The second law states that a force is proportional to an object's mass and its acceleration. But since the 1980s, some physicists have eyed the law with suspicion, arguing that subtle changes to it at extremely small accelerations could explain the observed motion of stars in galaxies." Also on the subject of spinning, a new experiment finds a way to test Modified Newtonian Dynamics (MOND) on Earth, which, if successful, could revise Newton's heretofore ironclad 2nd law...and explain away the longstanding dark matter problem. (By way of my new favorite Twitter feed, @newscientist.)

"'There's going to be all kinds of weird stuff out there,' said Alan Boss of the Carnegie Institute of Washington, who wasn't part of the research. 'This is an unparalleled data set. The universe really is a weird place. It's fantastic.'" In the midst of its current planet-hunting sweep, NASA's Kepler telescope discovers two examples of a new type of heavenly body that are "too hot to be planets and too small to be stars." (Although some think they're recently-born planets; others dying "white-dwarf" stars.) "'The universe keeps making strange things stranger than we can think of in our imagination,' said Jon Morse, head of astrophysics for NASA."

'We've looked at far, far fewer than 10 million stars since 1960, and so we really can't say anything worthwhile yet about whether or not intelligent life is out there,' Drake said. 'Given our capabilities now, we might have something useful to say one way or another in 25 years.'"

In the wake of all these new planets, the WP takes a gander at the new and improved SETI program. "'We're finding new extra-solar planets every week,' she said. 'We now know microbes can live in extreme environments on Earth thought to be impossible for life not very long ago, and so many more things seem possible in terms of life beyond Earth.'"

"Charbonneau said it's unlikely that any life on the newly discovered planet would be similar to life on Earth, but he didn't discount the idea entirely. 'This planet probably does have liquid water,' he said." Don't mean to turn GitM into the We Found a Planet Weekly, but this also seems like big doings: Astronomers discover a watery, Earth-like planet relatively nearby. (As in 40 light years away, orbiting GJ 1214b.) "While the planet probably has too thick of an atmosphere and is too hot to support life similar to that found on Earth, the discovery is being heralded as a major breakthrough in humanity's search for life on other planets." I'll say.

Update: "'I was instantly excited because the glint reminded me of an image of our own planet taken from orbit around Earth, showing a reflection of sunlight on an ocean,' Stephan said. 'But we also had to do more work to make sure the glint we were seeing wasn't lightning or an erupting volcano.'" Might be some more water closer to home too: NASA confirms liquid on Saturn's moon of Titan.

"It could be a planet, though even if it isn't, there's plenty of reason to be excited. For one thing, astronomers got an image of it. The reason it's so tough to image a planet is its proximity to the blinding light of its star, which in this case is about a million times brighter. It would be like trying to see a candle burning next to the beam of a million-candlepower searchlight." Astronomers spot a new planet called GJ 785 B -- by looking right at it. "In short, says McElwain, 'We're using state-of-the-art instruments on a state-of-the-art telescope.'"

"'We are still coming to terms with just how smooth the LHC commissioning is going,' said CERN Director General Rolf Heuer as the record was announced. 'It is fantastic.'" Atoms or systems into ruin hurl'd, And now a bubble burst, and now a world...Also in science news, the now armed and fully operational Large Hadron Collider is breaking particle beam records as it warms up for the Big Show, when its handlers will work to recreate the conditions at one billionth of a second after the Big Bang. "Said Heuer: 'We are continuing to take it step by step, and there is a lot to do before we start [first] physics in 2010. I'm keeping my champagne on ice until then.'" (By way of Dangerous Meta.)

"'The discovery opens a new chapter in our understanding of the moon,' the space agency said in a written statement." It's official: Data from NASA's LCROSS impact of a few weeks ago confirms the recent findings of Chandraayan-1: It ain't Hoth or Rura Penthe, but there is a "significant amount" of water on the moon, like, ice-field size.

"The amount of water they found in the plume was a couple of hundred kilograms in total, but that indicates there is a lot more still lying on the surface. They don't know how much exactly just yet." (As we found out recently, the same might also hold true of Mars.)

"'The full understanding of the LCROSS data may take some time. The data is that rich,' said Colaprete. 'Along with the water in Cabeus, there are hints of other intriguing substances. The permanently shadowed regions of the moon are truly cold traps, collecting and preserving material over billions of years.'" I'm very reminded of James Hogan's Inherit the Stars right now. Also, it's probably about time to start taking lunar exploration a bit more seriously again, eh?

"'Houston, Hubble has been released,' Atlantis commander Scott Altman radioed Mission Control. 'It's safely back on its journey of exploration as we begin the steps to conclude ours." The crew of STS-125 re-release the Hubble into high orbit, their epic repair-and-upgrade mission accomplished. "'We have literally thousands of astronomers out there around the world waiting to use these new capabilities,' Morse said. 'And they are chomping at the bit to get their data.'" Great work, Atlantis.

Update: Spiffy pic above -- and many more like it -- courtesy of Boston.com's The Big Picture and Hal at Blivet.

Speaking of NASA, somebody page Jim Starlin (and file this next to the Great Eye): Another holdover from last week, The agency's Chandra X-Ray Laboratory captures an eerie and beautiful galactic "hand" reaching across the cosmos. "[T]he display is caused by a young and powerful pulsar, known by the rather prosaic name of PSR B1509-58...The space agency says B1509 -- created by a collapsed star -- is one of the most powerful electromagnetic generators in the Galaxy. The nebula is formed by a torrent of electrons and ions emitted by the 1,700-year-old phenomenon. The finger-like structures are apparently caused by 'energizing knots of material in a neighboring gas cloud,' NASA says."

"'There is 'something new and interesting going on in the universe,' said Alan Kogut of NASA's Goddard Space Flight Center in Greenbelt, Md." Aspiring Jor-Els: Best get to work on those interstellar child-bearing rockets. Scientists detect a distant -- and very loud -- roar on the other side of the universe. "'The universe really threw us a curve,' Kogut said. 'Instead of the faint signal we hoped to find, here was this booming noise six times louder than anyone had predicted.'" (Sssh, listen...there went Earth-2.)

"'We've discovered this incredible dark energy, we don't understand what the hell it is,' said Lawrence Krauss, a physicist at Arizona State University. 'It's extremely small, extremely weak, and it's so close to being zero, it's just a total mystery why it should have this small value and not be zero." While they're still not entirely sure what in fact they're looking at, Harvard-Smithsonian astrophysicists announce they've found another way to measure and quantify "dark energy", a.k.a. the repulsive "cosmological constant" force causing the universe to expand rather than contract. "This is a much-needed confirmation that the earlier work was correct, the astronomers said, comparing it to football referees examining a controversial play with multiple camera angles."

As an added bonus, the results announced today also seem to confirm Einstein's general theory of relativity. "'It's never been proved right on the scale of the observable universe,' Spergel said."

"Although we think of black holes as somehow threatening, in the sense that if you get too close to one you are in trouble, they may have had a role in helping galaxies to form -- not just our own, but all galaxies." German astronomers believe they have discovered a black hole right in the center of our Milky Way. "According to Dr Robert Massey, of the Royal Astronomical Society (RAS), the results suggest that galaxies form around giant black holes in the way that a pearl forms around grit."

And, if that wasn't heady enough news to wrap one's mind around, see also this article on loop quantum cosmology (LQC) and "The Big Bounce." "LQC has been tantalising physicists since 2003 with the idea that our universe could conceivably have emerged from the collapse of a previous universe. Now the theory is poised to make predictions we can actually test. If they are verified, the big bang will give way to a big bounce and we will finally know the quantum structure of space-time. Instead of a universe that emerged from a point of infinite density, we will have one that recycles, possibly through an eternal series of expansions and contractions, with no beginning and no end." (Both links via Dangerous Meta.)

"It's really a generation that we've been looking forward to this moment, and the moments that will come after it in particular. September 10 is a demarcation between finishing the construction and starting to turn it on, but the excitement will only continue to grow." A Quantum Leap Forward, or the End of Days? (Answer: The former.) Over on the border of France and Switzerland, the Large Hadron Collider --- the giant, multi-billion-dollar particle accelerator decades in the making -- gets ready for its first big test on Wednesday (as does its accompanying "Grid".) "The collider will recreate the conditions of less than a millionth of a second after the Big Bang, when there was a hot 'soup' of tiny particles called quarks and gluons, to look at how the universe evolved, said John Harris, U.S. coordinator for ALICE, a detector specialized to analyze that question."

"'This is a landmark discovery because it implies that solar system analogs may be very common, at least scaled-down versions,' said Sara Seager, an extra-solar planet expert from the Massachusetts Institute of Technology. '...We are on an inexorable path to finding other Earths.'" Astronomers find a solar system not unlike our own 5,000 light years away. "We are seeing the emergence of a new planet-finding technique -- one that opens up an entirely new capability for planet finding. It is more powerful than we ever thought possible."

"It could be the weirdest and most embarrassing prediction in the history of cosmology, if not science. If true, it would mean that you yourself reading this article are more likely to be some momentary fluctuation in a field of matter and energy out in space than a person with a real past born through billions of years of evolution in an orderly star-spangled cosmos. Your memories and the world you think you see around you are illusions."

In today's NYT, Dennis Overbye attempts to explain the Boltzmann Brain problem, a theoretical puzzle causing consternation among cosmologists. “'It is part of a much bigger set of questions about how to think about probabilities in an infinite universe in which everything that can occur, does occur, infinitely many times,' said Leonard Susskind of Stanford, a co-author of a paper in 2002 that helped set off the debate. Or as Andrei Linde, another Stanford theorist given to colorful language, loosely characterized the possibility of a replica of your own brain forming out in space sometime, 'How do you compute the probability to be reincarnated to the probability of being born?'”

Um, yeah. The graphic sorta helps explain what may be going on: Minute fluctuations in the universe's general move towards entropy create random pockets of order, some of which could hypothetically organize as floating brains, or pocket universes or whales and flowerpots too, I suppose. Or something like that...Now my brain hurts.

"...as if millions of voices suddenly cried out in terror and were suddenly silenced." Scientists at NASA catch a glimpse of cosmic devastation on a galactic scale, as a "death star galaxy," fueled by a black hole, destroys its neighbor with a beam of radiation. "The telescope images show the bully galaxy shooting a stream of deadly radiation particles into the lower section of the other galaxy, which is about one-tenth its size...Tens of millions of stars, including those with orbiting planets, are likely in the path of the deadly jet...If Earth were in the way -- and it's not -- the high-energy particles and radiation of the jet would in a matter of months strip away the planet's protective ozone layer and compress the protective magnetosphere." And what does that mean? "'You would basically render extinct all surface forms of life,' Tyson said. 'But it may be that subterranean life is...immune to this kind of violence in the universe.'" You heard the man...start digging.

Have we inadvertently killed Schrödinger's cat? No, it's much, much worse. Cosmologists at Case Western Reserve and Vanderbilt speculate that mankind may have hastened the end of the universe by observing dark energy in 1998. "[Q]uantum theory says that whenever we observe or measure something, we could stop it decaying due what is what is called the 'quantum Zeno effect,' which suggests that if an 'observer' makes repeated, quick observations of a microscopic object undergoing change, the object can stop changing - just as a watched kettle never boils...Prof Krauss says that the measurement of the light from supernovae in 1998, which provided evidence of dark energy, may have reset the decay of the void to zero -- back to a point when the likelihood of its surviving was falling rapidly. 'In short, we may have snatched away the possibility of long-term survival for our universe and made it more likely it will decay,' says Prof Krauss." D'oh! But wouldn't this presume that at no other place or time in our unfathomably gigantic universe did any other civilization make the same observations? Given the odds of intelligent life out there, that seems unlikely. (And, if you think this all sounds goofy and ridiculous, just wait until we get to the multiverse...)

"Fact:...The density of Saturn is so low that if you were to put it in a giant glass of water it would float." And another pilfered link, which I meant to post last week: Megg of Quiddity points the way to 10 Cool Facts about Space (although, to paraphrase The Smiths, some facts are cooler than others.)

"'We're thrilled to have identified clear signs of water on a planet that is trillions of miles away,' said study leader Giovanna Tinetti of the Institut d'Astrophysique de Paris in France." Scientists discover clear signs of existing water well outside the solar system at HD 189733b, a Jupiter-ish gas giant in the Vulpecula constellation, 64 light years away. "The researchers found that the planet absorbed starlight in such a way that could only be explained by the presence of water vapor in its atmosphere."

"Because of its temperature and relative proximity, this planet will most probably be a very important target of the future space missions dedicated to the search for extraterrestrial life. On the treasure map of the Universe, one would be tempted to mark this planet with an X." The big news today, of course: Astronomers announce the discovery of an earth-like planet, Gliese 581c, at the galactically tiny distance of 120 trillion miles (20.5 light years) away. (For the stargazers, Gliese 581 is a red dwarf "located in the northeastern part of constellation Libra.") Of course, we still don't know if we even have to go that far to find extraterrestrial life -- Europa, Mars, Ganymede, and Callisto all still pose unresolved questions. Nevertheless, it's an exciting moment in our history to discover the first planet far afield that might possibly be inhabited (and inhabitable)...and even more exciting to know that there'll assuredly be many more to come. The stars, our destination!

A faraway Jupiter-like gas planet, HD 209458b, is found (by some) to have water in its atmosphere. I saw this on Blivet on Friday and spent the weekend dreaming about it: If my sleeping brain can be trusted, HD 209458b has winged, eel-like space reptiles cavorting amidst the gaseous clouds there. Alas, my subconscious makes for a lousy exobiologist: "[A] Jupiter-like gaseous planet such as this one, as opposed to a rocky one like Earth, is highly unlikely to harbour any kind of life." Well, damn.

Using the thankfully soon-to-be-refurbished Hubble, astronomers find more evidence of "dark energy" in the early universe working along the lines of Einstein's famous fudge factor, the cosmological constant, to combat a gravitational crunch. "'Dark energy makes us nervous,' said Sean Carroll, a theoretical physicist at the California Institute of Technology who was not involved in the supernova study. 'It fits the data, but it's not what we really expected.'"

The WP takes a gander at the Southern African Large Telescope (SALT), which "can see 13 billion years back in time, nearly to the big bang. With its 10-by-11-foot hexagonal mirror -- the largest of its type in the world -- SALT concentrates the faintest, most distant light in the universe. If a candle were to flicker on the moon, SALT could detect it."

After discovering a disk of gas, dust, and rubble orbiting a pulsar, astronomers believe they've figured out how planets are made. "It shows that planet formation is really ubiquitous in the universe. It's a very robust process and can happen in all sorts of unexpected environments."

Using the relatively new technique of gravitational microlensing, astronomers discover their "most Earth-like planet yet", orbiting a star in Sagittarius 20,000 light-years away. While this planet -- currently named OGLE-2005-BLG-390Lb -- is likely too cold for habitation, "'we may predict with reasonable probability that microlensing will discover planets with masses like that of Earth at a similar distance from their stars and with comparable surface temperature,' said study co-author Bohdan Paczynski from Princeton University."

"'As you go back in time, the universe is pushing [outward] less and less,' he said. 'At some point, the pressure of dark energy is zero and is exerting no force on the universe. There is no explanation for it.'" New cosmological research announced yesterday further muddles our understanding of the expansion of the early universe and (once again) casts doubt on Einstein's recently resurrected cosmological constant. "Schaefer based his findings on analysis of ultra-bright cosmic explosions called gamma-ray bursts, detected as far as 12.8 billion light-years away. He found that the most distant explosions appeared brighter than they should have been if the universe were accelerating at a constant rate."