The Small Magellanic Cloud pictured above actually spans 15,000 light-years or so and contains several hundred million stars. About 210,000 light-years distant in the constellation Tucana, it is the fourth closest of the Milky Way’s known satellite galaxies after the Canis Major and Sagittarius Dwarf galaxies and the Large Magellanic Cloud. (NASA/ESO/Stéphane Guisard)