Is there a barrier between space and the atmosphere
could you feel it?
yes it's a very powerful magnetic radiation belt! It's known as the Van Allen belt
There are several layers of the atmosphere...from sea level up...troposphere, stratosphere, mesosphere, thermosphere, exosphere
No gravity holds it all on earth and when you are in space and you come back into the atmosphere you could feel the impact of when you hit the atmosphere
Nope, the air just gradually gets thinner and thinner.