Extraterrestrial Life

Liquid camp winning out despite mixed signals.

NASA's planet-hunting satellite is making the case that it's a small-world galaxy, after all

Among projects under consideration by NASA is one that would send a boat to the hydrocarbon sea on Saturn's moon Titan to check out its composition and chemistry. John Matson reports.

The ambitious, unprecedentedly vast Square Kilometer Array project should open up new realms in astrophysics. But will it live up to its name?

This image of a region of Mars called Nili Fossae was released by the European Space Agency on May 6.

Photosynthetic plants on other planets that revolve around different kinds of suns could be mostly gray or black. Cynthia Graber reports

Radar soundings point to huge deposits of carbon dioxide near the Red Planet's south pole, which may have once contributed to a different climate

Earlier this year the scientists of NASA's Kepler mission announced that their planet-hunting space telescope had identified more than 1,200 possible exoplanets (worlds orbiting stars other than our own sun) in its first few months on the job.

Unidentified aerial phenomena offer a lesson on the residue problem in science