Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...

The search for intelligent life in our galaxy is shifting from abstract speculation to detailed cartography, as researchers try to sketch where alien societies might arise, thrive and vanish inside ...

Exoplanet observations reveal that Earth-like rocky planets require a certain concentration of those heavier elements.

Astrobiology: New supercomputer simulations of the universe reveal that the Milky Way provides the safest and most hospitable ...

"I usually try not to call things 'Rosetta stones,' but this is as close to a Rosetta stone as anything I've seen," said co-author John Johnson, also of Caltech. "It's like unlocking a language that ...