"[W]hat is the evidence that it recycles from the border? There's a lot of evidence now. ...The Hubble telescope was asked to look to see about the between ... 3C 273 is a quasar... close enough to us so that the light reaches us... and can't get into the atmosphere, so we asked [the Hubble telescope] to look at it and see if there are any clouds of between 3C 273 and ourselves that are going away from us at different speeds... [T]he Hubble telescope said that there are a whole block of clouds of hydrogen between 3C 273 and ourselves going away at different speeds, and so each one makes a shadow in the spectra and there are a whole lot of shadows. That's called the Lyman-alpha forest. So that's an old piece of evidence, and the Hubble telescope also said that there's more than enough in the intergalactic voids to make all the known galaxies."
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Hindus from the United StatesUniversity of California, Berkeley alumniAstronomers from the United States
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John Dobson (amateur astronomer)
John Lowry Dobson (14 September 1915 – 15 January 2014) was an American amateur astronomer and is best known for the Dobsonian telescope, a portable, low-cost Newtonian reflector telescope. He was also known for his efforts to promote awareness of astronomy (and his unorthodox views of physical cosmology) through public lectures including his performances of "sidewalk astronomy". Dobson was also the co-founder of the amateur astronomical group, the San Francisco Sidewalk Astronomers.
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