2006-10-15 08:36:43 · 3 answers · asked by damcmillan 1 in Science & Mathematics ➔ Earth Sciences & Geology
The upper region of the ionosphere fluctuates in width according to the time of day. Beyond that, the magnetosphere extends for thousands of miles.
2006-10-16 01:45:28 · answer #1 · answered by Johnny 3 · 0⤊ 0⤋
Just the the 1967 Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, that defined the edge of space as 100km above sea level.
2006-10-16 10:41:18 · answer #2 · answered by Nomadd 7 · 0⤊ 0⤋
NASA gives Astronaut Wings to anybody that flies over 50 miles up. That's where air pressure is effectively zero, and air-breathing engines won't work. It also means that by their definition, the Americans actually has a man "in space" before the Russians, as their experimental X15 rocket plane went that high a year or so before Gagarin's flight in Vostok I.
They're not fooling anybody though.
2006-10-16 11:42:28 · answer #3 · answered by Paul FB 3 · 0⤊ 0⤋