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Most every cosmologist believes the universe is flat. A new analysis argues that it’s closed.
How do magnetars get so magnetic? A study of stellar explosions shows that the long-accepted theory might be wrong.
The astronomers Michel Mayor and Didier Queloz won half of the prize for their 1995 discovery of a Jupiter-like planet orbiting a nearby star. The cosmologist James Peebles won the other half for work exploring the structure of the universe.
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.