"I asked 3 astronomers in the last 25 or 30 years... When a cluster of stars is formed out of a cloud of dusty , what proportion of this stuff makes into the stars, and what proportion is blown away by the stellar wind? ...[T]he first 2 ...said they don't have an immediate answer... but they thought that between 1 and 10% would make it into the stars, and between 90 and 99% would be blown away. ...[T]he 3rd man ...in more recent time ...said 95% ...is blown away, and in some cases more and in some cases less. So... what is all this ? It's blown away from when the stars were formed. ...[W]hen a galaxy is formed, it's just a cluster of stars and 99 or 95%... of this stuff is going to be blown away. Now that's what we see. Vera Rubin measured this for ... around it is all the rest of this stuff which is 10 times as much as we see in the galaxy... So the is perfectly ordinary matter..."
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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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