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.
If they aren't in space, then where else can they be?
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
The space between planets is known as interplanetary space. It is mostly vacuum but can contain small amounts of particles and gases.
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.
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.
they are bought into space for the stars and planets
To see if Life can survive in space or on planets.