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gamma-ray bursts

A large telescope with many segmented hexagonal mirrors.
astrophysics

Brighter Than a Billion Billion Suns: Gamma-Ray Bursts Continue to Surprise

By Jonathan O'Callaghan
June 30, 2021
Read Later

These ultrabright flashes have recently been tracked for days, upending ideas about the cataclysms that create them.

Spheres representing black holes, with small ones on top, large ones on the bottom, and one midsize example in the middle.
astrophysics

Long-Missing Midsize Black Hole Flashes Into View

By Jonathan O'Callaghan
March 29, 2021
Read Later

Black holes seemed to come only in sizes small and XXL. A new search strategy has uncovered a black hole of “intermediate” mass, raising hopes of more to come.

astrophysics

After Black Holes Collide, a Puzzling Flash

By Kevin Hartnett
March 2, 2016
Read Later

A satellite spotted a burst of light just as gravitational waves rolled in from the collision of two black holes. Was the flash a cosmic coincidence, or do astrophysicists need to rethink what black holes can do?

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