5 posts tagged with aliens and astronomy.
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Are humans unique and alone in the vast universe?

A New Empirical Constraint on the Prevalence of Technological Species in the Universe
Recent advances is exoplanet studies provide strong constraints on all astrophysical terms in the Drake Equation...We find that as long as the probability that a habitable zone planet develops a technological species is larger than ~ 10-24, then humanity is not the only time technological intelligence has evolved.
(Paper published in Astrobiology [paywalled]; preprint available on arXiv) [more inside]
posted by Existential Dread on May 21, 2016 - 57 comments

Clearly, it's not a rock...

An 'armchair astronomer' named David Martines has found something on Google Mars which he believes is some kind of space station. Allegedly, NASA is investigating the image. Another theory says that what he sees is a "linear streak artifact produced by a cosmic ray".
posted by anastasiav on Jun 6, 2011 - 104 comments

You're not alone

Many planets have been found circling other stars, but the prevailing search techniques turn up results encouraging but bizarre. (encouraging, previously) Gravitational micro-lensing has made it possible to OGLE a solar system much like our own.... You're not alone.
posted by Kronos_to_Earth on Apr 6, 2008 - 9 comments

The Hive Mind Discovers Aliens

The number of communicating alien civilizations = R* x fp x ne x fl x fi x fc x L. The formula is the Drake Equation, and modern estimates range from several thousand to none but us. You can solve it yourself. What is your estimate of the number of alien civilizations out there?
posted by blahblahblah on Aug 27, 2006 - 88 comments

We are not alone....

We are not alone.... a new planet outside of our solar system was found today. It's only a matter of time before the little green men come down to greet us.
posted by mathowie on Nov 13, 1999 - 0 comments

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