Define thick - all 4 outer planets plus Venus have thicker atmospheres than Earth.
Saturn's moon, Titan, has a thick 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.
Uranus and Neptune both have thick, gassy atmospheres that were formed by the left-overs of the formation of the planets.
Neptune.
Gravity is the force that keeps an atmosphere in place, surrounding a planet. Since there is no actual roof or container holding in the atmosphere, gas can always leak away into outer space, if it is not held in place by gravity. So the stronger the gravitational force, the more atmosphere can be retained. Large planets have a lot of hydrogen in their atmosphere, but hydrogen leaks away from smaller planets. Large planets attracted more gas when they were originally formed, as well. Remember that the solar system itself, and everything in it, originally condensed out of an interstellar cloud of gas and dust.
venus
Saturn's moon, Titan, has a thick atmosphere
No. Only Venus has a really thick atmosphere. Mars has only a thin atmosphere and Mercury has almost no atmosphere.
because its cold
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.
well there are no planets like that
Venus and the four outer planets all have a very thick and massive atmosphere.
YES. all planets have their own atmosphere. Jupiter's is huge and thick - it is all clouds.
gravity keeps the gas giants planets gases from escaping so they have thick atmosphere
jupiter and venus are the planets that are heavy and thick that would crush a human.
Thick air. Planets like Venus, Jupiter, Saturn, Neptune and Uranus have a very dense atmosphere.
Uranus and Neptune both have thick, gassy atmospheres that were formed by the left-overs of the formation of the planets.