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Quasars Are the Most Luminous Galaxies.

Quasars are the most luminous type of active galaxy ­— they emit light across the electromagnetic spectrum and can radiate thousands of times the energy emitted by our own Milky Way galaxy. Quasars also produce powerful particle jets. The nearest quasar is called Markarian 231 and is located roughly 600 million light-years away. Scientists use the light from far-off quasars to study black hole growth and galaxy evolution.

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