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Mounted on cardboard (30 x 50mm). Each spectrum is described by Hubble in pencil on the verso, and gives the recessional velocities of these galaxies, and other astronomical information:


Virgo Cluster 2,000 kilometers per second

In Ursa Major Cluster 15, 000 kilometers per second

These spectra were crucial in proving that our universe is expanding. The discovery that our universe expanded from a big bang ranks as one of the greatest discoveries of all time. Offered here are two “Rosetta stones” (or spectra) secured by Edwin Hubble (of Hubble Space Telescope fame) proving that the further a galaxy is away from the earth, the faster it moves away from us. Each spectrum is an original, printed on silver gelatin paper and mounted on cardboard. The handwriting of Edwin Hubble giving details of each spectrum appears on the cardboard, and is written in pencil. It appears that no such spectra have ever been offered to the public on auction before.

Information provided by Professor David Block.

  • Overall Condition: Very Good
  • Sold By: Clarke's Africana & Rare Books
  • Contact Person: Paul Mills
  • Country: South Africa
  • Email: [email protected]
  • Telephone: 021 794 0600
  • Preferred Payment Methods: Visa & Mastercard via PayGate secure links and Bank transfers.
  • Trade Associations: ABA - ILAB, SABDA

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