Which planets have atmospheres?

Answer 1

All of them. Any object large enough to be considered a planet will have enough gravity to hold onto an atmosphere. A planetary atmosphere is simply a set of conditions that maintain a certain stability around the planet. The atmospheric conditions can fluctuate (as does our atmosphere) but essentially conditions are similar from year to year.

Obviously there are variations of this. Some atmospheres are very cold. Some are hot. Some have toxic gases. Others have oxygen.

Answer 2

All of them do, to some extent. Mercury is often described as not having an atmosphere, though, because it doesn't have a permanent one - it temporarily traps gases from the solar wind. So depending on who you ask, some will say it doesn't have an atmosphere, some will say it does (I'm usually in the 'does not' camp).

Venus has an atmosphere much denser than Earths, while Mars has an extremely thin atmosphere. All the gas giant planets (Jupiter, Saturn, Uranus, Neptune) have significant atmospheres, as their name implies!

Even Pluto, which is not officially a planet anymore, has an atmosphere. But as it moves farther away from the Sun (it was closest about 15 years ago, and has a roughly 200 year orbit) its atmosphere will likely freeze out and fall back down to the surface.

Some moons have atmospheres, too, by the way - Titan's atmosphere is thicker than Earth's!

Answer 3

Since I breathe, Earth does. Mercury has none. Venus has a very dense, HOT, and acidic atmosphere. Mars has a very thin one, but -- it is there. Jupiter and Saturn are both gaseous cloud atmosphere planets. Nothing that you could breathe-!! And --= Uranus and Neptune have gases surrounding them, but they are probably mostly methane gas. Pluto, the demoted dwarf planet, is supposed to have no atmosphere. The question after this one should be -- do some of the moons which orbit around some planets, like Jupiter and Saturn - have atmospheres-? This one could be quite interesting!!

Answer 4

The atmosphere is the layer of gas that surrounds the planet. Mercury does not have any gases surrounding it, and thus no atmosphere. Mars has a very light layer which is frozen into the ice caps in the winter, thus we consider it to lack an atmosphere for all intensive purposes.

Venus, Jupiter, Saturn, Uranus, and Neptune all have atmospheres. Naturally so does the Earth.

Answer 5

The innermost planet with an atmosphere is Venus. Its atmosphere is composed of 96% carbon dioxide (the same gas which is dissolved in soft drinks). Of course our own planet, Earth, possesses a rich atmosphere, composed mainly of oxygen and nitrogen.

Mars' atmosphere is very thin, containing large quantities of carbon dioxide. Jupiter has a thick atmosphere composed mainly of hydrogen gas and helium (about 80% hydrogen, 20% helium), while Jupiter's clouds form from ammonia and water vapour. Despite the appearance of Saturn, its atmosphere's composition is very similar to Jupiter's, containing hydrogen and helium, plus smaller quantities of ammonia and methane. Uranus' atmosphere is similar to that of Jupiter and Saturn containing hydrogen, helium, and small amounts of methane. Methane has been found in Neptune's atmosphere, but it is otherwise thought to be similar to Uranus.

Spectroscopic observations have revealed ice water on the surface of Pluto with the possibility of a thin methane atmosphere.

Answer 6

All the planets have atmosphere.

Answer 7

all of the planets have atmosphere.. they just have different compositions

Answer 8

All have an atmosphere.

Mercury's is of (I dont know)
Venus and mars are of Carbon Dioxide.
Earth's everyone knows.
And about the Gas Giants -of Methane ,Hydrogen And Helium.

Answer 9

I belive they all have an atmosphere..
Some very little, some a lot...

Answer 10

All of them to varying degrees.