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Space is filled with an unimaginably large number of things; things that benefit us, like sunshine from the sun, and gravity, which keeps us in orbit and basically prevents us from flying into the abyss. But there are plenty more things that have been found in space that are very dangerous to earth, those are : Comets,Asteroids,Coronal Ejections,Interstellar Planets,High-Velocity Stars,Supernova,Rogue Black Holes,Gamma Rays and gamma ray burst,Big Rip,collision with andromeda and so on