Comet Lovejoy defied expectations and survived its closest approach to the sun late Thursday, leaving scientists the rare opportunity to chronicle a comet's near-death experience.
NASA's Mars explorer Curiosity, the most capable robotic rover ever built for taking the measure of a planet, is to launch Saturday morning. Curiosity will analyze the layered terrain in Gale Crater to read in its rocks the history of the environment there.
After a decade of "following the water," planetary scientists want to see if water co-existed with other critical environmental conditions that could have allowed simple forms of life to emerge.
After cost overruns and years of delay, the US is set to launch a prototype weather satellite before dawn Friday. Its data are badly needed as the number of Earth-observing satellites dwindle.
A newly discovered planet-candidate circling star LkCa 15 could provide astronomers with a first-ever look at a gas-giant planet as it grows. It could help prove or debunk current theories.
Skywatchers in North America will miss this lunar eclipse, but a second one this year will be visible in December, especially in western portions of the continent.
Lunar eclipse: The event is the first lunar eclipse of 2011 and one of two total lunar eclipses this year.
A solar flare erupted from the sun's surface Tuesday, but the star of the solar storm was something much larger – a coronal mass ejection. It is distorting Earth's magnetic field and will produce the northern lights (and southern lights) tonight.
Supermoon: The moon will makes its closest approach to Earth on Saturday, appearing closer and larger to the naked eye. The last supermoon was eighteen years ago.
Scientists seeking an astronomical first – discerning the atmospheric composition of a 'super Earth' exoplanet – have now learned enough to rule out one leading theory.