The Silence of the Empty Cantina.

“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?“

Spinning Faster.

“The change is negligible, but permanent: Each day should be 1.26 microseconds shorter, according to preliminary calculations. A microsecond is one-millionth of a second.” So, on the bright side, I guess that means we’ll all live to be a little older. The devastating 8.8 earthquake in Chile has apparently permanently shortened Earth’s day.

“Such changes aren’t unheard of. The magnitude 9.1 earthquake in 2004 that generated a killer tsunami in the Indian Ocean shortened the length of days by 6.8 microseconds. On the other hand, the length of a day also can increase. For example, if the Three Gorges reservoir in China were filled, it would hold 10 trillion gallons (40 cubic kilometers) of water. The shift of mass would lengthen days by 0.06 microsecond, scientists said.”

Shedding Light on (a) Dark Matter?

“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.)

Broken-Hearted? Just Make a New One.

“To start with, only simple tissues, such as skin, muscle and short stretches of blood vessels, will be made…[H]owever, that the company expects that within five years, once clinical trials are complete, the printers will produce blood vessels for use as grafts in bypass surgery. With more research it should be possible to produce bigger, more complex body parts. Because the machines have the ability to make branched tubes, the technology could, for example, be used to create the networks of blood vessels needed to sustain larger printed organs, like kidneys, livers and hearts.”

Also in the Brave New World dept. and by way of a friend, The Economist takes a gander at new “bioprinter” technology. “As for bigger body parts, Dr Forgacs thinks they may take many different forms, at least initially. A man-made biological substitute for a kidney, for instance, need not look like a real one or contain all its features in order to clean waste products from the bloodstream.“

A Long Way Down.

“36,000 Feet: The Challenger Deep, lowest known point in the ocean. It is believed there are lower undiscovered points, as only 10% of the ocean has been mapped.” There are old, foul things in the Deep Places of the World: By way of DYFL and Lots of Co, a rather off-putting graphic of the Mariana Trench to scale. Venturing out into the Great Beyond of space always sounds exhilarating to me. But, for some reason, being that far down below the murky depths…not so much.

A Matter of Minutes.

“According to the board, the looming dangers included: the perils of 27,000 nuclear weapons, 2,000 of them ready to launch within minutes; and the destruction of human habitats from climate change.” Paging Dr. Manhattan: Tomorrow at 3pm, the Bulletin of Atomic Scientists will move the minute hand on the Doomsday Clock, currently set (since 2007) at five minutes to midnight. (The official site is here.)

No word yet on which way we’re headed, but I presume they wouldn’t be going to all this media-event trouble if the news is good. Update: I stand corrected. We’re at six minutes to midnight now. Smoke ’em if you got ’em.

A Hot Mess.

“‘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.”

Totally Tubular.

“Any intact lava tube could serve as a shelter from the severe environment of the lunar surface, with its meteorite impacts, high-energy UV radiation and energetic particles, and extreme diurnal temperature variations.” In a tube in the ground lived…a human? An international team of researchers identify a lava tube in the moon’s Marius Hills as a good spot for a lunar colony. Just watch out for the exogorths.

SETI 2.0.

“‘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.’”

Waterworld.

“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.