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Scientists who traveled to the Arctic on a NASA research cruise last summer were looking for signs of climate change. What they found was a secret world hidden beneath the region's cap of sea ice. [More]

Lawmakers grilled NASA chief Charles Bolden today (March 21), saying the deep cuts to NASA's planetary science program in the agency's 2013 budget request will "cannibalize" future Mars exploration and threaten America's leadership in space. [More]

NASA/JPL-Caltech/Cornell University THE WOODLANDS, Texas Planetary scientists, usually an affable lot, are plenty riled up at the moment. [More]

NASA/JPL-Caltech/Cornell University THE WOODLANDS, Texas Planetary scientists, usually an affable lot, are plenty riled up at the moment. [More]

NASA/JPL-Caltech/Cornell University THE WOODLANDS, Texas Planetary scientists, usually an affable lot, are plenty riled up at the moment. [More]

Scientists at NASA's Jet Propulsion Laboratory have put out a new video to address false claims about the "Mayan apocalypse," a non-event that some people believe will bring the world to an end on Dec. 21.

By Eric Hand of Nature magazine It took years of fierce debate to winnow the dozens of potential landing sites for NASA's Mars Curiosity rover down to just one. [More]

By Eric Hand of Nature Magazine On 4 January, John Grunsfeld, the fix-it-man for the Hubble Space Telescope, became the head of NASA's Science Mission Directorate. [More]

A pair of NASA spacecraft are ringing in the new year in grand style, with both now successfully circling the moon after journeying through space for more than three months. [More]

A pair of NASA spacecraft is getting set to orbit the moon this weekend, a move that will kick off the probes' effort to study Earth's nearest neighbor from crust to core. [More]

An x-ray image of the region around Sgr A*. Credit: NASA/CXC/MIT/F.K.Baganoff et al.

NASA has lost or misplaced more than 500 of the moon rocks its Apollo astronauts collected and brought back to Earth, according to a new agency report.

SAN FRANCISCO A mantra that has driven global negotiations on carbon dioxide emissions for years has been that policy-makers must prevent warming of more than two degrees Celsius to prevent apocalyptic climate outcomes. And, two degrees has been a point of no return, a limit directly or indirectly agreed to by negotiators at international climate talks. James Hansen, director of the NASA Goddard Institute for Space Studies in New York, whose data since the 1980s has been central to setting that benchmark, said today that two degrees is too much.

NASA's orbiting Kepler telescope has discovered its first planet in the habitable zone of another star. By "habitable," astronomers mean that a planet could harbor temperatures conducive to liquid water--and maybe life. [More]