At this altitude, a conventional plane would need to reach orbital velocity or risk falling back to Earth. In theory, once this 100 km line is crossed, the atmosphere becomes too thin to provide enough lift for conventional aircraft to maintain flight. This leaves the door open for a variety of interpretations.Ī common definition of space is known as the Kármán Line, an imaginary boundary 100 kilometers (62 miles) above mean sea level. International law states that outer space shall be free for exploration and use by all, but there is no definitive law stating where national air space actually ends and outer space begins. Although most people are generally in agreement that space begins when Earth’s atmosphere ends- where exactly that is depends on who you ask. ![]() It's the final frontier and also happens to be where NOAA operates the Nation's environmental and meteorological satellites.īut where is “space” exactly? This may seem like a simple question, but any answer beyond “up” may be more complicated than you think.
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