How quasars allow scientists to measure the Universe?

It has been said that astronomy is both geography and history, because to study our stellar surroundings,

[International Gemini Observatory/NOIRLab/NSF/AURA/J. da Silva, CC BY 4.0, via Wikimedia Commons]

Every galaxy has the because it contains a supermassive black hole. To be called a quasar, a great deal of matter must flow into it, which causes, among other things, the object to glow very…

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