It's difficult or impossible to answer because planets have been discovered going round a few nearby stars, but the number of external solar systems could be very high.
About 4.5 billion.
The planets that have the most space between them are mercury and Pluto.
Astronomy is the renaissance that studies the planets. They study the planets and space.
Gas giants (for the outer planets), versus rocky planets.
Inner rocky planets and outer gas giant planets. (There are also Ice giants and dwarf planets)
There are 7 main classification of Planets. They are classified into the following groups; * Inferior Planets * Superior Planets * Inner Planets * Outer Planets * Terrestial Planets, * Jovian Planets * Gas Giants
There are mountains on planets in space but there is no number on how many.
230
Space is wonderful place with many marvelous planets out there.
About 4.5 billion.
it was created by many stars and planets,and space
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.
Back in space is good name. Space is to mestirous and interesting subject. I think about space, star, planets, satellite and so many things
billions and millions in the whole of space
in space