Atmosphere does a number of things for us. For starters, atmosphere contains oxygen, the gas we need for cellular respiration. Without oxygen, we would all die very quickly. Atmosphere also protects us from the harmful ultraviolet (UV) radiations of Sun. It also prevents a large amount of space debris from reaching the surface of Earth. Extra-terrestrial objects burn up in our atmosphere and thus hardly ever reach the surface. Atmosphere is also responsible for greenhouse...
Atmosphere does a number of things for us. For starters, atmosphere contains oxygen, the gas we need for cellular respiration. Without oxygen, we would all die very quickly. Atmosphere also protects us from the harmful ultraviolet (UV) radiations of Sun. It also prevents a large amount of space debris from reaching the surface of Earth. Extra-terrestrial objects burn up in our atmosphere and thus hardly ever reach the surface. Atmosphere is also responsible for greenhouse effect, which keeps the temperatures high enough for the life to survive and also ensures small variations between daytime and nighttime temperature. Atmosphere traps some of the solar radiations and keep the Earth warm, without the atmosphere, the surface temperature would be very low. Lack of atmosphere will also mean that all the oceans would evaporate very quickly (since water boils at lower temperature, when air pressure is low).
In essence, lack of atmosphere would have meant no life and no water on this planet, very low temperatures, high amount of solar radiations and bombardment by extraterrestrial objects.
Hope this helps.
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