How far above Earth does Earth's atmosphere end and space begin?

Question

Like where?

Answer 1

Officially, space starts at 62 miles - 100 kilometers. But, there's still traces of atmosphere. The space station, at 200 miles, needs a boost in it's orbit periodically due to atmospheric friction slowing it down. Skylab, originally at 240 miles, crashed to Earth in 1979 because of it.

Answer 2

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The Earth's atmosphere doesn't really stop at a certain place and then "space" begins. The air gets thinner as you go up from the surface and the farther from Earth you get the thinner it is. It gets thinner still if you leave our solar system and even thinner in intergalactic space. But it is always there. In reality, no volume of space can ever be perfectly empty. A perfect vacuum with a gaseous pressure of absolute zero is a philosophical concept that does not exist in nature. The exosphere is the last atmospheric layer before space. Since there is no clear boundary with space and the exosphere, the exosphere is sometimes used synonymously with outer space. A level of Earth's atmosphere called the exobase ranges from about 250 to 500 kilometres (160 to 310 mi) depending on solar activity. The exobase is the lowest altitude of the exosphere, and is formally defined in one of two ways: 1. The height above which there are the negligible atomic collisions between the particles and 2. The height above which constituent atoms are on purely ballistic trajectories. The fluctuation in the height of the exobase is important because the atmosphere below this level provides significant atmospheric drag on satellites, eventually causing them to fall from orbit if no action is taken to maintain the orbit. .

Answer 3

Where Does Space Begin

Answer 4

There's no exact boundary--the atmosphere just gets thinner and thinner until its down to nothing.

The official boundary that internationalagreements established is 100 kilometers (62) miles above mean sea level. That's arbitrary, though. At that point you are in spaces, pretty much. But there are traces of atmosphere out for several hundred miles.

Answer 5

The 'normal' answer for this is: about 60 miles above the surface. There, the atmosphere gets to be so thin, that you could describe it as a hard vacuum.

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Answer 6

What about the suubmission that the atmosphere extends to about 10000 km above the earth's surface? Clearly far fetched..

Answer 7

99.99997% of the mass of Earth's atmosphere is below 100 km but there is no clearly defined boundary for where the atmosphere ends and space begins.

Answer 8

about 60 miles

Answer 9

He is right 60 miles