What happen if there is no atmosphere?
Eventually (long after surface life had died), solar radiation would break atmospheric water into oxygen, which would react with carbon on the Earth to form carbon dioxide.
The air would still be too thin to breathe.
The lack of atmosphere would chill the Earth’s surface.
Plants and land animals would die..
Which has no atmosphere at all?
Long answer: Mercury is the only planet in our Solar System that has no substantial atmosphere. Technically speaking it does have an extremely thin atmosphere but it’s so thin that for all practical purposes it might as well be a vacuum. See Why doesn’t Mercury have an atmosphere?
Can we survive without atmosphere?
Without the atmosphere, we would find it very hard to survive. Humans can last weeks without food, days without water, but only minutes without air. We also consume it at a higher rate: humans breathe the equivalent of 13 kg of air each day, compared with eating 2.4 kg of food and drinking 1 kg of liquid.
Why do some planets have no atmosphere?
There are two primary factors: size and distance from the Sun. Gravity helps planets and moons to hold on to their atmospheres, so small planets/moons such as Mars and the Moon have thin atmospheres. … This is why Mercury has no atmosphere, but much smaller and colder Pluto can still retain a thin atmosphere.