Science, Maths & Technology
Where does outer space begin?
...think about it. Kittinger and mini-Dallas were both carried up by a balloon, and a balloon only goes up if it (plus its 'astronaut' payload) is on average less dense than the air that it displaces. That’s how buoyancy works. There must still be air – albeit very tenuous – at the height reached by the balloon, otherwise, it could not float. There is not a vacuum at...