Hubble and the VAR! Plate

TODAY IN PHILOSOPHY OF HISTORY: Hubble and the VAR! Plate

On Saturday 06 October 1923, 101 years ago today, the astronomer Edwin Hubble dated a photographic plate that showed a Cepheid variable star in Andromeda. This marked a major turning point in the reconstruction of cosmology and cosmological history, since it was a scientific demonstration of the universe consisting of many galaxies—known at the time as the island universe hypothesis—later shown by Hubble to be many galaxies expanding. With this discovery, the universe became a different place from what we have previously believed it to be.

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