How High is Space? Astronomy Facts

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SUMMARY

The Kármán line, positioned at an altitude of 100 km, is widely recognized as the boundary between the Earth's atmosphere and outer space. While this definition is prevalent, it does not account for the atmospheric effects on orbital flight, indicating that a higher altitude is necessary for achieving a complete orbit. Despite its limitations, the Kármán line serves as a practical reference point for defining the start of space.

PREREQUISITES
  • Understanding of the Kármán line and its significance in aerospace
  • Basic knowledge of atmospheric layers and their characteristics
  • Familiarity with orbital mechanics and flight dynamics
  • Awareness of the differences between aerodynamic and orbital flight
NEXT STEPS
  • Research the implications of the Kármán line on space travel and aerospace engineering
  • Explore the characteristics of the Earth's atmosphere at various altitudes
  • Study orbital mechanics to understand the requirements for achieving orbit
  • Investigate alternative definitions of the boundary of space beyond the Kármán line
USEFUL FOR

Aerospace engineers, astronomers, students of physics, and anyone interested in the definitions and implications of space boundaries.

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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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