Aha Trivia Stuff Everyone Should Know
Aha Trivia: Stuff Everyone Should Know · ahatrivia.com/mb-astronomy-faaad414778f

What did Edwin Hubble prove about spiral nebulae?

They are galaxies outside our own.

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  1. They are galaxies outside our own ✔
  2. They are clouds in Earth's sky
  3. They are moons of Jupiter

Why: Hubble identified Cepheid variables in spiral nebulae and proved they were entire galaxies beyond the Milky Way.

Huh, didn't know that: Hubble identified Cepheid variables in spiral nebulae and proved they were entire galaxies beyond the Milky Way.

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Hubble expanded our universe-view!
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References

Answer: They are galaxies outside our own. Hubble identified Cepheid variables in spiral nebulae and proved they were entire galaxies beyond the Milky Way.

  1. Astronomy en.wikipedia.org/wiki/Astronomy
    proved conclusively that Andromeda Nebula and Triangulum among others, were entire galaxies outside our own
    Checked 2026-11-07.

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