The Challenge Remains.

“We’ve grown used to wonders in this century. It’s hard to dazzle us. But for twenty-five years the United States space program has been doing just that. We’ve grown used to the idea of space, and perhaps we forget that we’ve only just begun. We’re still pioneers. They, the members of the Challenger crew, were pioneers.“

25 years after a dark day in January, the Challenger is remembered. [Pictures.]
Update: As Dangerous Meta reminds me, yesterday was the 44th Anniversary of the Apollo 1 tragedy, and Tuesday will be the 8th anniversary of Columbia’s fall. This is just a terrible week for slipping the surly bonds and getting off-world.

V’Ger Sails On.

“‘Needless to say, none of us expected it was going to be operating for so long,’ said Krimigis, now 72. ‘We were all praying to get to Neptune [in 1989]. But after that? Who thought we could be with this 33 years [after launch]?’“

Though it’s past 11 billion miles, it’s feeling very still (after all, no more solar wind)…
By way of a friend, and as the spacecraft reaches the outer edge of the solar system, the Baltimore Sun checks in on Voyager 1 and its makers. “Voyager was the pinnacle of his career, said Ness, now 77. “There is never going to be a mission in anybody’s lifetime, now living, that is ever going to get these observations in hand. So it’s once in a lifetime.“

Life…But Not as We Know It.

“Our findings are a reminder that life as we know it could be much more flexible than we generally assume or can imagine,” Felisa Wolfe-Simon, an astrobiology researcher at the U.S. Geological Survey, said.“

Whoa. NASA announces it has discovered a strange new bacteria in California’s Mono Lake that use arsenic instead of phosphorus, previously considered indispensable to life. “It gets in there and sort of gums up the works of our biochemical machinery,’ ASU’s Ariel Anbar, a co-author of the Science paper, explained.

Big doings? Definitely — The existence of these viable microbes suggests new biochemical possibilities for life on distant (or even not-so-distant) planets. But Discover‘s Ed Yong advises caution: “The discovery is amazing, but it’s easy to go overboard with it…For a start, the bacteria – a strain known as GFAJ-1 – don’t depend on arsenic. They still contain detectable levels of phosphorus in their molecules and they actually grow better on phosphorus if given the chance. It’s just that they might be able to do without this typically essential element – an extreme and impressive ability in itself.“

Update: “As soon as Redfield started to read the paper, she was shocked. ‘I was outraged at how bad the science was,’ she told me.” Hold the champagne: Slate‘s Carl Zimmer surveys the scientific pushback, and it is considerable. “‘[N]one of the arguments are very convincing on their own.’ That was about as positive as the critics could get. ‘This paper should not have been published,’ said Shelley Copley of the University of Colorado.”

My God, It’s Full of Stars.

“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.“

Dark Side of the Moon.

“Fate has ordained that the men who went to the moon to explore in peace will stay on the moon to rest in peace.These brave men, Neil Armstrong and Edwin Aldrin, know that there is no hope for their recovery. But they also know that there is hope for mankind in their sacrifice. These two men are laying down their lives in mankind’s most noble goal: the search for truth and understanding.“

In a fascinating remnant of alternate history, Letters of Note unearths Nixon’s Safire-penned speech on the (possible) failure of Apollo 11. “Others will follow, and surely find their way home. Man’s search will not be denied. But these men were the first, and they will remain the foremost in our hearts.”

Marshes of the Moon.

“‘It’s really wet,’ said Anthony Colaprete, co-author of one of the Science papers and a space scientist at NASA Ames Research Center at Moffett Field, Calif. He and his colleagues estimate that 5.6% of the total mass of the targeted lunar crater’s soil consists of water ice. In other words, 2,200 pounds of moon dirt would yield a dozen gallons of water.“

In keeping with recent studies, NASA is set to announce that there appears to be quite a lot of water on the moon, which would greatly facilitate setting up shop there. Alas, “the U.S. likely won’t be involved in manned voyages to the moon anytime soon…But other countries are gearing up. China has pledged to land astronauts on the moon by 2025, and India has plans to do the same by 2020. Japan wants to establish an unmanned moon base in a decade.” And, hey, why go to the moon when you can spend a decade in Afghanistan?

Earth Too.

“‘We’re pretty excited about it,’ admits Steve Vogt, of the University of California, Santa Cruz, a member of the team, in a masterpiece of understatement. ‘I think this is what everyone’s been after for the past 15 years.’” And then some! Apparently, astronomers have discovered the most Earth-like planet yet in Gliese 581g, a relatively short 20 light years away.

“[I]t probably has a solid surface just like Earth. Much more important, it sits smack in the middle of the so-called habitable zone, orbiting at just the right distance from the star to let water remain liquid rather than freezing solid or boiling away. As far as we know, that’s a minimum requirement for the presence of life.“

Some might remember that Gliese 581c was all the rage two years ago. Apparently, this one — in the same solar system but only just discovered — is even closer to the real deal. (Good thing the NASA authorization just passed…)

One Hundred Years of Solitude.

“[W]e are entering an increasingly dangerous period of our history. Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment for good or ill. But our genetic code still carries the selfish and aggressive instincts that were of survival advantage in the past. It will be difficult enough to avoid disaster in the next hundred years, let alone the next thousand or million. Our only chance of long-term survival is not to remain inward-looking on planet Earth, but to spread out into space. We have made remarkable progress in the last hundred years, but if we want to continue beyond the next hundred years, our future is in space.“

Once again, Professor Stephen Hawking makes the case for manned exploration, sooner rather than later — as in living off-world within the next century. In other words, we need to get busy living, or get busy dying.

The X Flies.

“The Planetary Society, an advocate for commercial space ventures, also said in a release: ‘The proposal to refocus NASA’s human spaceflight program beyond low-Earth orbit now looks more achievable, as this flight demonstrated that commercial rockets may soon be ready to carry supplies and, we hope, astronauts to the International Space Station.’“

Congratulations to Space X on their successful Falcon-9 launch last Friday. “After Friday’s successful test launch — unusual for a maiden voyage — SpaceX plans to send a fully operational rocket and capsule into orbit this summer, and one to the ISS next year.”

Titan A.E.?

“We suggested hydrogen consumption because it’s the obvious gas for life to consume on Titan, similar to the way we consume oxygen on Earth. If these signs do turn out to be a sign of life, it would be doubly exciting because it would represent a second form of life independent from water-based life on Earth.“

In potentially very big doings, two astrobiology papers suggest that some form of life is currently consuming gas and fuel on Saturn’s moon of Titan (The gas being hydrogen and fuel being acetylane, which would make sense for a methane-based life form.) “We suggested hydrogen consumption because it’s the obvious gas for life to consume on Titan, similar to the way we consume oxygen on Earth. If these signs do turn out to be a sign of life, it would be doubly exciting because it would represent a second form of life independent from water-based life on Earth.’” Yes, that would be exciting.

Update: NASA’s Chris McKay advises scientific caution. “This is a still a long way from ‘evidence of life’. However, it is extremely interesting.”