A new study has discovered that three supernovae explosions, which occurred between 2.3 and 8.7 million years ago, sent shockwaves all the way to Earth. Scientists analyzed the chemical composition of deep-sea sediments, and determined that the supernovae were located between 140 and 300 light-years away, making them close enough to have caused significant harm. This finding is the first evidence that supernovae explosions can cause serious damage even from such distances. The research team believes that these events could have triggered mass extinctions of marine life, and could serve as a cautionary tale for our own species.

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source: Phys.org