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Shortly after 4 a.m. Wednesday morning, MESSENGER reached its greatest speed relative to the Sun. The spacecraft, nearly 70 percent closer to the Sun than Earth, was traveling nearly 140,880 miles per hour (62.979 kilometers per second) relative to the Sun.
Read MoreThe first NASA spacecraft to image and map the dynamic interactions taking place where the hot solar wind slams into the cold expanse of space will be launched on Sunday, October 19, at 1:48 p.m. EDT.
Read MoreGamma-ray bursts, powerful glares of high-energy that wash through the Universe once every day or so are, for a brief time, the brightest objects in the gamma-ray sky.
Read MoreFrom the Mars Reconnaissance Orbiter comes a remarkable photo that reveals a 37,000 square-kilometer (almost 23,000 miles) dust storm that moved counter-clockwise through the Phoenix landing site on October 11.
Read MoreSeasonal twilight is approaching for Saturn's south polar vortex — the giant hurricane-like storm swirling around the planet's southern pole.
Read MoreIt's served the longest of six other spacecraft and now as a reward, NASA's Mars Odyssey will alter its orbit and continue on for a third two-year extension of its mission to examine the most Earthlike of known foreign planets. Odyssey originally reached Mars in 2001.
Read MoreIn the process of circling Earth, Venus Express' task is to observe whether Earth is habitable, which is no joke, but rather an exercise. Venus Express is paving the way for an exciting new era in astronomy having taken its first image of Earth with its Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) soon after its launch in November 2005.
Read MoreDifferent wavelengths of light swirl together like watercolors in a new, ethereal portrait of a bright, active star-forming region.
Read MoreNASA's Cassini spacecraft will fly by Saturn's geyser moon, Enceladus. The October 9th flyby is the closest flyby yet of any moon of Saturn, at only 25 kilometers (16 miles) from the surface. The October 31 flyby is farther out, at 196 kilometers (122 miles).
Read MoreCOROT is a mission led by the French Space Agency (CNES), with contributions from ESA, Austria, Belgium, Germany, Spain and Brazil. The craft has discovered a massive, planet-sized object orbiting its parent star closely, unlike anything ever spotted before.
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