Al writes: "The Fermi Paradox focuses on the existence of advanced civilisations elsewhere in the galaxy. If these civilisations are out there--and many analyses suggest the galaxy should be teaming with life--why haven't we seen them? Carlos Cotta and Álvaro Morales from the University of Malaga in Spain add an another angle to the discussion about the speed at which a sufficiently advanced civilisation could colonise the galaxy. Various analyses suggest that using spacecraft that travel at a tenth of the speed of light, the colonization wavefront could take some 50 million years to sweep the galaxy. Others have calculated that it may be closer to 13 billion years, which may explain ET's absence. Cotta and Morales study how automated probes sent ahead of the colonisation could explore the galaxy. If these probes left evidence of a visit that lasts for 100 million years, then there can be no more than about 10 civilisations out there."
coondoggie writes: "NASA said last week that MIT will lead a $375 million mission to map the moon and reconstruct its thermal history. The mission, called the Gravity Recovery and Interior Laboratory (GRAIL) will put two separate satellites into orbit around the moon to precisely map variations in the moon's gravitational pull. These changes will reveal differences in density of the moon's crust and mantle, and can be used to answer fundamental questions about the moon's internal structure and its history of collisions with asteroids, NASA said in a statement.
from the or-maybe-we're-just-getting-more-intelligently-designed dept.
John Hawks writes "A new genomics study in PNAS shows that humans have been evolving new adaptive genes during the past 10,000 years much faster than ever before. The study says that evolution has sped up because of population growth, making people adapt faster to new diseases, new diets, and social changes like cities. Oh, and I'm the lead author. I've been reading Slashdot for a long time, and let me just say that our study doesn't necessarily apply to trolls."