Nothing - no really nothing at all.
if you want to find out please go to the space and use the ruler
Accretion
As they need space to carry out photosynthesis.
My teacher Mrs. Black said before that it was gravity that holds the planets together in space.
They are so massive that they remain gravitationally bound to together.
There was a big bang.. then space came with lovely stars but there was no planets.. when alot of rocks formed together another big bang had come and made.. EARTH!
Here is one lie about how planets are formed: One day Zeus took a big doodoo. All his doodoo was floating in space and they clumped together to form the planets.
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
Space