We know the Milky Way is one among billions of galaxies, but Edwin Hubble was the first to prove our galaxy is not alone. A special kind of star, a “Cepheid variable,” helped him make this discovery.
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Produced by the Space Telescope Science Institute, Office of Public Outreach
All images, illustrations, and videos courtesy of NASA, ESA, and STScI except:
- Milky Way panoramas courtesy of ESO/Y. Beletsky and ESO/Bruno Gilli
- Photos of Edwin Hubble courtesy of Huntington Library
- Andromeda Galaxy image courtesy of Bill Schoening, Vanessa Harvey/REU program/NOAO/AURA/NSF
- Photo of Henrietta Leavitt courtesy of American Institute of Physics, Emilio Segrè Visual Archives
- M33, M94, NGC 55, M49, and M84 images courtesy of NOAO/AURA/NSF
- NGC 6822 image courtesy of Local Group Galaxies Survey Team/NOAO/AURA/NSF
- NGC 1232 image courtesy of ESO/P. Grosbøle
- NGC 4449 image courtesy of Digital Sky Survey/AURA
- NGC 1300 image courtesy of Hillary Mathis/NOAO/AURA/NSF
- Small Magellanic Cloud image courtesy of F. Winkler/Middlebury College, the MCELS Team, and NOAO/AURA/NSF
- NGC 55 color image courtesy of T. A. Rector/NOAO/AURA/NSF
- Written by Vanessa Thomas
- Designed by John Godfrey