They're not.
all planets.
Mercury doesn't "have planets".
yes there is 2 planets but there are also dwarf ones too.
Do all planets and satellites lie on the same gravitational layer?
Mars, Uranus, and Venus are the planets with four letters in their names.
Planetesimals.
No two planets share the same moon.
They're not.
they are the same
all planets.
The planets of our solar system are most definitely NOT all the same size.
* saturn * uranus
Mercury doesn't "have planets".
yes there is 2 planets but there are also dwarf ones too.
there are no inner gas planets only outer gas planets but they are the same because they all have rings, they are all made of gas.
Planets are larger and more massive than asteroids, but very nearly the same size and mass as planets.