Scott Tremaine, “Astrophysical Wonders” (Open Agenda, 2021)
New Books in Science, Technology, and Society
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What Is the Most Extremely High Luminosity of Quasars?
The most extreme examples of that are quasars. They were originally found just as things that looked like stars, but the spectrum didn't look like stellar spectra. The key advance came in the early sixties when a particular bright quazar was discovered to be in the path of the moon. And since you know the moon's orbit very accurately, if you can measure the time at which the light from the quazar disappears, you know exactly where it is.
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