Nebulas= Exploded Stars, Eventually collect to form aother star Galaxys= tons of Stars pulled together by a Massive Force or gravity, Like a black hole, or a mega sun The Chance on us finding aliens relys on 3 things 1) If we look after earth 2) If we ever colonise another planet in this solar system 3) Beating the "Max Speed" (Light) If all 3 are done, and then its likely we'll find them someday Umm aliens will have had to visit the earth one time, Earth was seeded..... We are made out of the inside of stars, Really, Things that make us are make in there But it takes a star to explode for it to spread over a planet And theres no proof of a star going Kaboom Here (No BlackHole, No Nebula, Nothing)
