Aside from being one of the few reasons life such as ours can exist on this planet due to the unique balance between oxygen, nitrogen, and carbon dioxide; the way it shields us from the parts of...
The atmosphere is important for two main reasons. It is the air that you breathe so, no atmosphere, no breathing. The other reason is it protects you by burning up the meteoroids that could hit earth.
Becuase the more you know the more you can tell and scientist will learn and the more they can figure out space and maby one day you can visit all the planets.
Answer .
Atmospherics.