Comet Pan STARRS, seen March 12, 2013, as it swung around the sun (next viewing in 100,000 years).
This side-by-side comparison shows the X-ray diffraction patterns of two different samples collected from the Martian surface by NASA's Curiosity…
This false-color map shows the area within Gale Crater on Mars, where NASA's Curiosity rover landed on Aug. 5, 2012…
As big as a tennis court and as tall as a four-story building, a full-scale model of the James Webb…
This image from NASA's Solar Dynamics Observatory on Mar. 11, 2013, at 8:00 a.m. EDT, shows the moon crossing in…
Puffy white exhaust contrails stream from the engines of NASA's DC-8 flying laboratory in this image taken from an HU-25…
This artist's concept depicts NASA's Juno spacecraft above Jupiter's north pole. Launched in 2011, the Juno spacecraft will arrive at…
Puffy white exhaust contrails streamed from the engines of NASA's DC-8 flying laboratory in this photo taken from an HU-25…
NASA engineer Chip Holloway waits for the sun to align with the Stratospheric Aerosol and Gas Experiment (SAGE III) during…
Something unexpected is happening on the Sun. 2013 was supposed to be the year of "solar maximum," the peak of…
