Gamma-Rays Spewed As a Black Hole Forms Might 'Reverse Time'

By Yasemin Saplakoglu, Staff Writer | August 23, 2018 02:41pm ET

As a massive star collapses into a black hole, it sends out a brilliant SOS signal in the form of ultrabright gamma-ray bursts. Now, scientists have found something very peculiar about those mysterious signals: They seem to reverse time.

Well, sort of.

A new study, published Aug. 13 in The Astrophysical Journal, has found that these gamma-ray bursts are time-reversed, meaning the brilliant light wave is spit out one way and then sent out again in the opposite order.

The researchers said they have no idea what's causing these time-reversed gamma-ray signals, but they added that the physics around black holes are so strange that nothing can be ruled out. [Supernova Photos: Great Images of Star Explosions]

Last gasps of dying stars
Gamma-ray bursts are some of the highest-energy explosions ever detected, shining brighter than a million trillion times the output of Earth's sun, according to NASA.

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https://www.livescience.com/63415-time-reversed-structures-gamma-ray-bursts.html