- Astronomers using the ESA's Euclid telescope found 31 ancient quasars — including the two earliest known — that shone just ~670 million years after the Big Bang (about 13.1 billion years ago).
- Those quasars blaze about a trillion times brighter than the Sun, powered by supermassive black holes with masses of hundreds of millions to billions of suns.
- Their existence so early deepens a big mystery: how did such huge black holes grow so fast? Euclid's discoveries open a new era for studying this puzzle.
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