How far is the first layer off space from earth?

there is no clear boundary between the Earth and outer space. As you climb in altitude, the atmosphere gets less dense as you go. You need to get about 350 km (220 miles) above the Earth鈥檚 surface to get to the point where a spacecraft can orbit the planet.


But various agencies have designated lower altitudes for the beginning of space. The Federation Aeronautique Internationale has established the Karman line at an altitude of 100 km (62 miles). Above this altitude, a vehicle would need to be going more than orbital velocity to get enough lift from the atmosphere to support itself.


NASA considers people to be astronauts once they鈥檝e traveled higher than 80 km (50 miles).


http://www.universetoday.com/guide-to-sp鈥?/a>How far is the first layer off space from earth?
The earth's atmosphere officially ends at approximately 800 km (500 miles) but shuttles and the northern lights have been seen at altitudes of around 690 km (431 miles).





On average, the ISS (International Space Station), is about 199 to 215 miles above the surface of the Earth








See this site for interesting documentation


about Space and the Earth -


http://www.docstoc.com/search/distance-b鈥?/a>How far is the first layer off space from earth?
Most people consider 60 miles up the beginning of space. 99% of the atmosphere is below you and no jet will work and no steering surfaces on a plane will work. from 60 miles on, it is rockets or yet to be known magnetic or gravitational drive system.
I think it's rather antropocentric to say that space has layers, rather than the Earth's atmosphere.
I think that about 99% of the atmosphere can be defined to be contained within 100km of the surface.





Edit: Wow, just realized that I copied Owl eye's answer.

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