How High is Space? Astronomy Facts

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Discussion Overview

The discussion revolves around the question of how high space is, exploring definitions and concepts related to the boundary between the atmosphere and space. It includes theoretical considerations and varying definitions of where space begins.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that space is infinite and does not have a definitive boundary, as it is described as "relatively nothing."
  • Others reference the Kármán line at 100 km as a common definition for the start of space, though they note it is not universally accepted.
  • A participant argues that the Kármán line is based on aerodynamic flight considerations and does not account for orbital flight, suggesting that a higher altitude may be necessary for achieving orbit.
  • There is acknowledgment that while 100 km is a widely recognized figure, it has limitations and may not fully capture the complexities of the atmosphere's impact on different types of flight.

Areas of Agreement / Disagreement

Participants express differing views on the definition of where space begins, with some supporting the Kármán line and others questioning its adequacy. The discussion remains unresolved regarding the best definition of the boundary of space.

Contextual Notes

The discussion highlights limitations in the definitions provided, including the dependence on specific contexts such as aerodynamic versus orbital flight, and the potential for varying interpretations of what constitutes "space."

!Jon Snow!
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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?
 
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As far as space goes, there is no end. Because space is relatively nothing, its infinite.
 
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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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