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

What is interstellar space?

The space between the stars in a galaxy.

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

Why: Inter means between and stellar means stars. Interplanetary space is inside our solar system, around the planets. Interstellar space starts beyond our Sun's bubble of solar wind.

Huh, didn't know that: Voyager 1 reached the edge of interstellar space in 2012, the first human-made object to do it.

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Why did the star get a good report card? It was interstellar at everything.
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References

Answer: The space between the stars. Inter means between and stellar means stars. Interplanetary space is inside our solar system, around the planets. Interstellar space starts beyond our Sun's bubble of solar wind.

  1. CAP Aerospace Dimensions Module 5, Space Environment (Alaska Wing copy) akwg.cap.gov/media/cms/Module_5__Space_Environment_C640727DEF762_83c5b.pdf
    interstellar space - the region in space between the stars in a galaxy
    Checked 2026-10-10.
  2. NASA: Voyager Interstellar Mission science.nasa.gov/mission/voyager/interstellar-mission
    Voyager 1 reaching the interstellar boundary in 2012
    Checked 2026-10-10.

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