There are a variety of outer space bodies that exist other than the planet. These bodies are studied in a variety of institutions and they are researched on how they affect the planet we live in.
There have been speculations that a comet or a large body could collide with the earth and end all life as we know it.
There has not been enough evidence to support the claims however.
There are many outer space bodies like meteors that enter into the earth’s atmosphere and are not very destructive.
So far, there isn’t much worry about these bodies destroying the planet.