Which statement best describes what a quasar is?

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Study for the NOVA Black Hole Apocalypse Astronomy Test. Explore astronomy with our rich content. Use flashcards and multiple-choice questions to enhance your knowledge. Prepare effectively and uncover the mysteries of black holes. Get ready for your exam!

Multiple Choice

Which statement best describes what a quasar is?

Explanation:
Quasars are extremely luminous centers of distant galaxies powered by gas falling into a supermassive black hole. Because they are so far away, they appear like point-like, star-like sources, yet their energy output is staggering and detected across the electromagnetic spectrum, often with strong radio emission. This combination—star-like appearance due to distance, enormous intrinsic brightness from an active galactic nucleus, and significant radio emission—makes the description in the statement the best fit. The other options describe objects that don’t match these characteristics: a nearby variable star, a planet, or a comet.

Quasars are extremely luminous centers of distant galaxies powered by gas falling into a supermassive black hole. Because they are so far away, they appear like point-like, star-like sources, yet their energy output is staggering and detected across the electromagnetic spectrum, often with strong radio emission. This combination—star-like appearance due to distance, enormous intrinsic brightness from an active galactic nucleus, and significant radio emission—makes the description in the statement the best fit. The other options describe objects that don’t match these characteristics: a nearby variable star, a planet, or a comet.

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