impact between planets formation of new worlds, big bang, theia and earth impact and formation of the moon

apocalypse armageddon asteroid astronomy background bang belt big catastrophe collision comet cosmos crater creation danger debris discover doomsday earth environment exoplanet exoplanets explosion falling fiction field formation galaxies galaxy global gravitational group impact isolated meteor meteorite meteoroid minerals mining moon nature new orbit outer planet planets probe rendering rock satellite science scifi sky solar space star stone swarm system theia unexplored universe worlds