The answer is Pluto. I found the info. on this site http://en.wikipedia.org/wiki/Pluto. Hope this helps.
The only outer planet without a thick atmosphere is Uranus. It has a thin atmosphere composed mostly of hydrogen and helium with traces of methane.
The answer is Pluto. I found this on wicapedia.:)
Venus and the four outer planets all have a very thick and massive atmosphere.
No, there are four. They are Jupiter, Saturn, Uranus and Neptune.
Uranus
Saturn has the moon Titan which has a thick hazy atmosphere.
All the outer planets, Jupiter being the thickest.
The outer planets have thick atmospheres because they are so big. The bigger the planet, the stronger the gravitational pull. This means that the bigger planets pull in more gasses, which creates a bigger, thicker atmosphere.
Venus
Venus.
Jupiter
Venus is the hottest planet, as it is close to the sun and also has a thick carbon dioxide atmosphere that holds the heat effectively.Venus is extremely hot because its thick atmosphere, rich in carbon dioxide, traps heat energy from the sun.