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.
Use data from NASA's Kepler spacecraft to find undiscovered planets outside our solar system
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...
An astronomer makes the case that the best place to search for habitable planets may be very close to white dwarf stars. Karen Hopkin reports
Unidentified aerial phenomena offer a lesson on the residue problem in science
A new analysis suggests lightning and volcanoes helped make life possible. David Biello reports
A newfound planetary system has six worlds, five of which rank among the smallest known, and the list of unconfirmed candidates has swelled to four figures
Kepler's latest discovery is step closer to a true Earth analogue.
If we are ever going to pick up a signal from E.T., it is going to happen soon, astronomers say. And we already have a good idea how events will play out
Thirty-three years into its voyage, the solar wind speed around Voyager 1 has dropped to zero as the space-hardened craft nears a milestone in its journey out of the solar system
Video taken by the Saturn-orbiting Cassini spacecraft reveals evidence of three volcanoes that appear to be gushing liquid water through the moon's icy surface. The activity could be a source replenishing the methane in Titan's atmosphere, which is broken down by sunlight...
Discoveries of distant planets are challenging theorists to think deeply about extraterrestrial life
Researchers question the science behind last week's revelation of arsenic-based life.
A bacterium has been discovered that can substitute arsenic for phosphorus in fundamental life chemistry. Christopher Intagliata reports