"Cosmic explosions thousands of light-years away could shut down photosynthesis in the ocean at depths of up to 260 feet, a new study suggests. The calculations add to a growing body of research linking these great blasts, called gamma-ray bursts, with biological damage and even mass extinctions on Earth.
Gamma-ray bursts are tremendous explosions detonated during a massive star’s death throes. When stars eight times the mass of the sun or larger reach the end of their lives, they die in spectacular supernova explosions that can temporarily outshine entire galaxies."
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