Celestial hemisphere:  Northern  ·  Constellation: Andromeda (And)
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Hubble's Variable Star M31-V1 - "The Star that Changed the Universe", G400
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Hubble's Variable Star M31-V1 - "The Star that Changed the Universe"

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Hubble's Variable Star M31-V1 - "The Star that Changed the Universe", G400
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Hubble's Variable Star M31-V1 - "The Star that Changed the Universe"

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With this Variable Star Edwin Hubble was able to determine the distance from "us" and hence to show that this nebula was not part of our own Milky Way but a galaxy of its own.
https://science.nasa.gov/missions/hubble/hubble-views-the-star-that-changed-the-universe
https://www.bav-astro.eu/rb/rb2019-1/14.pdf

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Hubble's Variable Star M31-V1 - "The Star that Changed the Universe", G400