The Spirals are galaxies that are moving away from each other. The Hooker 100 inch telescope in California saw first light in 1917. It was built to determine the nature of the spiral nebulae. Edwin Hubble used the Hooker to prove that the spiral nebulae were galaxies like the Milky Way. He also made the surprising discovery, from the spectra of their starlight, that the galaxies are moving away from each other - we live in an expanding Universe.