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The Cassini spacecraft observes three of Saturn's moons set against the darkened night side of the planet.

The SpaceX Dragon's release from Canadarm2 occurred at 6:56 a.m. EDT. Expedition 35 will command the spacecraft to slowly depart.

This view of Curiosity's left-front and left-center wheels and of marks made by wheels on the ground in the "Yellowknife Bay" area comes from one of six cameras used on Mars for the first time more than six months after the rover landed. The left Navigation Camera (Navcam) linked to Curiosity's B-side computer took this image during the 223rd Martian day, or sol, of Curiosity's work on Mars (March 22, 2013). The wheels are 20 inches (50 centimeters) in diameter.

The bulk of the Planck computations were performed on the Cray XE6 supercomputer, named for computer scientist Grace Hopper, at the Department of Energy's National Energy Research Scientific Computing Center at the Lawrence Berkeley National Laboratory, Berkeley, Calif.

Computer models offer a new look at the molecular machinery that enables cells to interact with their environment. This schematic shows two integrin components (red and blue) protruding from a cell membrane.

This image is composed of data from the INT Photometric H-Alpha Survey (IPHAS), including narrow-band H-Alpha (red) and broad-band Sloan r' (green) and Sloan i' (blue) filters.