Astronomers have devised an instrument that could lift the veil of doubt over whether we're alone in the universe.
Hints that Jupiter's moon Ganymede, the largest moon in the solar system, has a subsurface ocean date back more than 40 years, but it took the Hubble Space Telescope and some clever scientific detective work by to come up with the proof.
Does it exist or not? Astronomers are claiming that the potentially habitable exoplanet is just noisy data, while others say it's too early to discount the existence of Gliese 581d.
The hunt for signs of life on planets beyond our solar system should cast as wide a net as possible, some researchers stress.
As NASA applauds its boosted budget request, scientists at NASA's Jet Propulsion Laboratory are excited to see a robotic mission to Europa take a big step towards being launched in the mid-2020s.
NASA's Kepler spacecraft has discovered its 1,000th alien planet, further cementing the prolific exoplanet-hunting mission's status as a space-science legend.
After pointing the Allen Telescope Array at a newly-found exoplanet discovered by NASA's Kepler space telescope, SETI reports there is no transmitting alien civilization. But the search continues...
The huge geysers on Jupiter's icy moon Europa have gone underground.
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