There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. Three quarters of the atmosphere's mass is within 11 km of the planetary surface. In the United States, people who travel above an altitude of 80.5 km (50 statute miles) are designated astronauts. An altitude of 120 km (~75 miles or 400,000 ft) marks the boundary where atmospheric effects become noticeable during re-entry. The Kármán line, at 100 km (62 miles or 328,000 ft), is also frequently regarded as the boundary between atmosphere and outer space.
2007-12-03 13:58:47
·
answer #1
·
answered by Anonymous
·
1⤊
1⤋
The "conventional" limit to the start of space is 100 km, or 62 miles.
2007-12-03 13:49:14
·
answer #2
·
answered by Keith P 7
·
2⤊
0⤋
don`t believe that 30,000 mile fige. The real answer is 62 miles is considered the boundary of space.
2007-12-03 13:53:25
·
answer #3
·
answered by Silverhorn 6
·
1⤊
0⤋
As weekend warrior noted; there is no definite boundary.
However, if you look at a photo of earth taken from space; particularly during one of the moon missions, you realise a startling fact: As far as we are concerned, the 'usable' atmosphere is at best 10 km thick (the summit of Mt Everest is at 8km).
But when you look at one of those photos, the blue sky is seen as the thinnest line, thinner by comparison than the skin of an onion. The atmosphere is a fragile thing; and we don't have much of it. Let's not mess it up.
2007-12-03 18:15:21
·
answer #4
·
answered by AndrewG 7
·
0⤊
1⤋
You mean outside our atmosphere? Inside the distance is 0.
2007-12-03 13:49:47
·
answer #5
·
answered by Cotton Candy Lady 5
·
0⤊
1⤋
It is 30,000 miles from land to the outskirts of the stratosphere
2007-12-03 13:49:08
·
answer #6
·
answered by Anonymous
·
1⤊
3⤋
it is 30,000 to start space and 1,174,303 to the sun
2007-12-03 13:53:20
·
answer #7
·
answered by ryanpowell17 2
·
1⤊
1⤋