ALT An artist concept portrays a round, gaseous object on a black, star-filled background. The object, a brown dwarf, occupies the right half of the image. It is various shades of dark blue and is streaked with undulating horizontal bands that encircle it, much like the planet Jupiter in our solar system. It is tilted to the right and toward the viewer so that one pole is completely visible. The pole is circled by a curtain of red representing an aurora.

ALT A dramatic snapshot of the Opportunity rover’s shadow on the rocky and sandy Martian surface from the low angle of a front-facing hazard avoidance camera. On either side of the black-and-white image are the rover’s treaded wheels. The rim of the crater Endurance is in the background and it slopes down from left to right. The image was taken on sol 180 (July 26, 2004), a date that marks achievement of fully double the rover's primary 90-sol mission. Credit: NASA/JPL-Caltech

ALT A bright, full Moon, as seen from the International Space Station. The Moon hangs near the top-right corner of the image, with its lunar seas and other features clearly visible. Beneath it, Earth's cloudtops stretch across the bottom half of the photo at a slightly downward angle, with blue skies fading to black at the image's top border. Credit: NASA/Jeff Williams