Galaxies, Milky Way The Milky Way and Andromeda galaxies are approaching each other. With current technology, how long would it take before we could directly measure the apparent increase in size of Andromeda?
Deep-Sky Objects, Galaxies The Southern Pleiades, the Ghost of Jupiter, and dwarf spheroidal galaxy Leo I
Exotic Objects, Galaxies Gravitational wave search provides insights into galaxy evolution and mergers
Deep-Sky Objects, Galaxies, Stars The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199
