http://nineplanets.org/ is the best site I have ever found regarding planets. I use it extensively teaching 8th grade Astronomy.
An atmosphere is a layer of gas that is part of a planet, and usually surrounds it solid part, if there is a solid part. so for each planet, there is one and only one plant in its atmosphere. The earth is the only planet in the Earth's atmosphere; Mars is the only plant in the Martian atmosphere; etc.,
because there isn't an atmosphere
Each of the four inner planets has an atmosphere, except Mercury. Mercury is too small and close to the sun for its gravity to sustain a proper atmosphere, although a tenius and unstable exosphere it thought to exist.
The solar system doesn't have an atmosphere, it occupies a piece of space which is an empty vacuum. Each planet may have its own atmosphere, a layer of gas at the surface.
The atmosphere gets thicker and thicker as you go down; the planets basically consist mainly of atmosphere, though those planets are expected to have a solid core.
because there isn't an atmosphere
because there isn't an atmosphere
because there isn't an atmosphere
because there isn't an atmosphere
because there isn't an atmosphere
Space does not have an atmosphere. It is generally considered a vacuum. Planets and some moons have atmospheres.
the outer planets are gaseous and the inner planets are not