Space Exploration

New Horizons went into “safe mode” on Saturday but the probe should be back to normal science operations by Tuesday, exactly one week before it performs the flyby 

The Rosetta spacecraft, currently orbiting Comet 67P/Churyumov-Gerasimenko, has spotted 120 bright, reflective spots on the surface of the comet, for which water ice is a plausible explanation

As the legendary space telescope enters its twilight years, astronomers are searching for a replacement, but no one agrees about what it should accomplish

The destruction of an unmanned rocket Sunday comes at a tricky time for NASA and the International Space Station

SpaceX holds a $1.6-billion NASA contract to fly at least 12 unmanned unmanned runs to the space station; the previous six flights had all been successful

The newfound planet is 96 light years away, but it's the closest twin to Jupiter astronomers have ever directly seen

NASA’s former director of astrophysics plans to revolutionize space science with agile, privately funded missions

Kepler-138b is the first world smaller than Earth to have its size and mass measured

The same particles that streak through Earth's atmosphere as "shooting stars" kick up lunar dust when they strike the surface of the atmosphere-less moon. Christopher Intagliata reports

In celebration of the Philae lander waking up from its long slumber, we take a look back at other spacecraft that have experienced resurrections

The universe’s hidden stuff could be a mirror world of invisible particles and “dark atoms”