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

ALT Milky Way Bulge. Several stars fill the image, ranging in hues of white, red, blue, and orange.

ALT The Bubble Nebula. A glowing, blue, and roughly spherical structure surrounds pink stars in a hazy cosmic vista full of green, yellow, and gold dust and gas.

ALT NGC 6217. A barred spiral galaxy shines against black space dotted with a few stars. A bar of bright stars extends diagonally right on either side of the yellow core. Its short spiral arms are full of dark brown dust and pink and blue regions of star formation.