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A giant star’s death throes may offer the first evidence of a pair-instability supernova, and a glimpse of the first stars in the universe.
At stake are fundamental ideas about how black holes form — and a six-way bet.
New measurements could upend the standard theory of the cosmos that has reigned since the discovery of dark energy 21 years ago.
After an interstellar asteroid shot past the sun, scientists realized that there’s probably a lot of itinerant rocks out there.