ALT Bright, star-like Venus in the late dusk sky near the thin crescent Moon glowing amid the clouds. Photo: NASA/Bill Dunford

ALT A view of crescent Mars against black space. The planet\u2019s warm color glows faintly along its rim. Credit: NASA/JPL-Caltech/ASU

ALT A bird\u2019s-eye view of the double-ring Martian crater Huygens, seen in the top right of the image. The colors appear as a dramatic, blotchy mix of radiant blue and rusty red. Credit: NASA/JPL-Caltech/ASU

ALT A photo of Mars, partially shadowed toward the top of the image, from its south polar region. The planet appears gray from this angle, and its southern ice cap is stark white by contrast. Credit: NASA/JPL-Caltech/ASU

ALT A bird\u2019s-eye view of the rusty-red Martian surface. The surface is heavily cratered with white outlines around them, streaky due to the planet\u2019s wind. Credit: NASA/JPL-Caltech/ASU

ALT An artist's concept depicting two suited astronauts working on the lunar surface. One is standing next to a surface light, while the other is kneeling; equipment, including rovers and habitations, dot the hilly landscape surrounding them. Credit: NASA

ALT The Moon fully eclipsing the Sun as seen from space. The Moon appears as a dark disc in a black sky, silhouetted by a glowing halo. Also visible are stars in the background, some of which are planets.

ALT A crescent Earth setting behind the Moon\u2019s horizon. Credit: NASA

ALT Earth setting behind the Moon as seen by the Artemis II crew. Over half the left side of the image is filled by the gray lunar surface, pocked with craters. Credit: NASA

ALT A close view of the Moon. Jagged circles of craters dot the gray surface, fading to dark on the left side of the image. Credit: NASA

ALT A crescent Earth setting behind a hemisphere of the Moon. Credit: NASA