Size beyond one megametre Ten to the power of six Ganymede, Callisto Wolf 359 Size beyond one gigametre Ten to the power of nine Sirius, Altair Vega, Polaris Size beyond one terametre Ten to the power of twelve Antares, Pistol Star Betelgeuse Size beyond one petametre Ten to the power of fifteen Stringray Nebula, Ring Nebula Helix Nebula, The Spire Hourglass Nebula Size beyond one exametre Ten to the power of eighteen Omega Centurai, Messier 54 Tarantula Nebula Size beyond one zettametre Ten to the power of twenty-one Milky Way, Andromeda Galaxy Fornax Cluster Size beyond one yottametre Ten to the power of twenty-four Virgo Super Cluster, Eridanus Supervoid Super Cluster Complex