The answer is Pluto. I found this on wicapedia.:)
Mars
The answer is Pluto. I found the info. on this site http://en.wikipedia.org/wiki/Pluto. Hope this helps.
Venus and the four outer planets all have a very thick and massive atmosphere.
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.
No, there are four. They are Jupiter, Saturn, Uranus and Neptune.
Venus.
Saturn has the moon Titan which has a thick hazy atmosphere.
Uranus
Venus
venus
All the outer planets, Jupiter being the thickest.
Venus has the thickest carbon dioxide atmosphere.