Quasars are:
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Most luminous objects known to man
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Objects from much earlier in the universe's history
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A compact region in the center of a massive galaxy surrounding its central supermassive black hole
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Inexplicable, small objects in distant space
Reveal answer
Fill a bubble to check yourself
A,B,C
Correct answer
Explanation
Quasars are the most luminous objects in the universe, powered by supermassive black holes at the centers of galaxies. Because they are extremely bright and distant, we see them as they were billions of years ago, making them windows into the early universe. Option D is wrong because quasars are neither small nor inexplicable - their immense energy output is well-understood as coming from accretion disks around black holes.