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.
All the planets in the solar system would fit in the sun with lots of space left over.
Astronomy is the renaissance that studies the planets. They study the planets and space.
do the densities of the solar system planets fall into two or more groups
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?
to explore many different planets, galaxies, comets, possible planets we can live on, etc.
they can orbit or rotate around in space
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