SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-cislunar-space

What part of space is called cislunar space?

The space between Earth and the Moon.

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  1. The space between the stars
  2. The space beyond Neptune
  3. The space between Earth and the Moon ✔

Why: Cis means on this side of, and lunar means the Moon. So cislunar space is our neighborhood out to the Moon. Space agencies plan many future missions in this region.

Huh, didn't know that: The Moon orbits about 239,000 miles from Earth, so cislunar space is roughly that deep.

The dad joke
Why did the astronaut stay in cislunar space? She did not want to go too far out of her comfort zone.
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References

Answer: The space between Earth and the Moon. Cis means on this side of, and lunar means the Moon. So cislunar space is our neighborhood out to the Moon. Space agencies plan many future missions in this region.

  1. CAP Aerospace Dimensions Module 5, Space Environment (Alaska Wing copy) akwg.cap.gov/media/cms/Module_5__Space_Environment_C640727DEF762_83c5b.pdf
    cislunar space - the space between the Earth and the Moon
    Checked 2026-10-10.

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