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So what exactly are quasars made up of?
At first the astronomers thought they were stars
I doubt very much that this is true.
Actually I read that phrase from thisI doubt very much that this is true.At first the astronomers thought they were stars, but further observations showed that they were not stars.
A good reference on the history is here:
https://arxiv.org/pdf/1304.3627.pdf
The discovery of quasars in 1963, and more generally, active galactic nuclei (AGN), revolutionized extragalactic astronomy. In early February 1963, Maarten Schmidt (b. 1929; Figure 1) ...