what atmosphere has almost no molcules
The troposphere holds almost all of the water vapor in the atmosphere as well as approximately 75-80% of the total mass of the atmosphere.
troposphere
== ==
Almost non-existent. For all practical purposes, there is no atmosphere.
troposphere
murcury
Saturn is a planet. I think you mean moons. Saturn has about 63 moons. I say about, because it may have more.
Mercury has almost no atmosphere so that could be the answer. The otherpossible answeris Mars, which certainly does have a (thin)atmosphere.
The troposphere holds almost all of the water vapor in the atmosphere. This is the lowest layer of the Earth's atmosphere where weather events occur, and it is where most of the water cycle processes take place.
Earth's atmosphere is almost 200 times thicker than the atmosphere of Mars. The atmosphere of Earth is primarily nitrogen and oxygen, while the Martian atmosphere is primarily carbon dioxide.
No. Only Venus has a really thick atmosphere. Mars has only a thin atmosphere and Mercury has almost no atmosphere.