Venus
Venus.
it is Venus.mercury has no atmosphereVenus has a thick atmosphere.which is so thick that we cannot see through it with the help of any telescopeearth has a medium-thin atmospheremars has a thinner atmosphere than that of earth
Although being closer to the sun, Mercury is the colder of the two planets. Venus's thick atmosphere allows for a greater greenhouse effect, trapping heat easily and retaining it for longer than Mercury can.
mercury
No. For example Venus is the second closest planet but is the hottest. This is because it has a thick atmosphere and therefore it holds the heat in more than Mercury (the closest planet) does.
They don't all have thick atmospheres. Mars has a thin atmosphere and Mercury barely has an atmosphere at all. No planet in the solar system other than Earth has significant amounts of elemental oxygen in the atmosphere. This is the gas we get from breathing. Additionally, the other planets are too hot, too cold, or have pressure that is too high or too low for us to breathe.
thicker than earth's atmosphere.
Saturn is the least dense out of all of the planets in our solar system. Its average density is around 0.7 g/cc (less than water). It also has a thick Hydrogen/Helium atmosphere.
Venus. It is further away to the sun than Mercury, but Mercury has a thin atmosphere. Venus has a very thick, toxic atmosphere that traps all the sun's heat.
The atmosphere of Venus is the layer of gases surrounding Venus. It is composed primarily of carbon dioxide and is much denser and hotter than that of Earth.
The mean density of Saturn is 0.687 g/cm³ For comparison, the density of water is about 0.970 g/cm³. This means if you could find a bath big enough, Saturn would float in water.
All planet's years are longer than their days except for Venus.You probably meant to ask which planet's day is longer than its year, and the answer is Venus.