... The Antennae Galaxies in Collision . ... That's because galaxies are mostly empty space and, however bright, stars only take up only a small amount of that space. ... Andes Sunset Eclipse . ... On July 11, after a long trek eastward across the southern Pacific Ocean, the Moon's shadow reached landfall in South America. ... Mosaic: Welcome to Planet Earth . ... Seen from our edge-on perspective, the Milky Way Galaxy sprawls across the middle of this false-color, all sky view. ... July . ...