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How High is Space?

  1. Sep 4, 2014 #1
    Look up, there’s space. Astronomically speaking, it’s right there, just outside a thin layer of atmosphere. But how far away is it? How high is space?
     
  2. jcsd
  3. Sep 4, 2014 #2
    As far as space goes, there is no end. Because space is relatively nothing, its infinite.
     
  4. Sep 4, 2014 #3

    Drakkith

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    Staff: Mentor

    The Kármán line, at an altitude of 100 km, is typically used as the start of space and the end of the atmosphere, but not always.

    http://en.wikipedia.org/wiki/Kármán_line
     
  5. Sep 5, 2014 #4

    BobG

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    Science Advisor
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    Not always because the Karman line considers the impact the atmosphere has on aerodynamic flight, but ignores the impact the atmosphere has on orbital flight. You'd actually have to be a bit higher than 100 km to achieve at least one entire orbit.

    But at least 100 km is a nice round number.

    And it is the most common definition, in spite of its shortcomings.
     
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