If they aren't in space, then where else can they be?
Because of gravity and space is the universe for all planets.
Astronomy is all about the things in outer space and planets are in outer space.
The planets that have the most space between them are mercury and Pluto.
in space
Space
Astronomy is the renaissance that studies the planets. They study the planets and space.
in space
Space does not have an atmosphere. It is generally considered a vacuum. Planets and some moons have atmospheres.
Space astronauts went to the planets to be sure there is no life on planets
It is something in space that divides the inner planets and outer planets.
Because they are to small to be considered planets.
Space was born with planets we don't live in like Mars, Sun, And Jupiter. It need other planets to help keep Space alive forever. It can't just have Earth.
Because Planets are one of the only types of celestial bodies able to fill space, and they are being held in space by gravity. if you want a scientific answer, the big bang would be the reason planets are in space. if you want a religious answer: God put them there.