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The star that changed the universe
Soderblom, David Space Telescope Science Institute, Baltimore, Maryland.
- Hubble's achievement
- Copies of Hubble's plate
- HST observations of Hubble's variable
- Additional Reading
On the night of October 5/6, 1923, Edwin Powell Hubble took an astronomical photograph that is now famous (Fig. 1). He used the 100–in. (2.5–m) Hooker telescope on Mount Wilson, above Pasadena, CA, to expose a 4 × 5–in. (102 × 127–mm) glass plate for 45 min. He had pointed the telescope at a field in M31, the great nebula in Andromeda, and he was engaged in a long-term effort to first find Cepheid variable stars in M31 and to then measure their light curves. Doing this would enable Hubble to determine the distance to M31, a matter much in dispute at that time.
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