How High is Space? Astronomy Facts

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Space begins at the Kármán line, typically defined as 100 km above sea level, marking the boundary between the atmosphere and outer space. However, this definition is debated since it focuses on aerodynamic flight and does not account for the requirements of orbital flight, which necessitates a higher altitude. The concept of space is inherently infinite, as it is defined by the absence of matter. While 100 km is a widely accepted benchmark, it is not universally applicable for all aspects of space exploration. Understanding these nuances is crucial for discussions about the altitude of space.
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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.
 
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
 
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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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