Deadly “red sky” solar storm from 800 years ago discovered in ancient trees

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Powerful solar activity can create stunning auroras on Earth, but outside the protection of our planet's magnetic field, the Sun can become extremely dangerous. Violent eruptions such as solar flares and coronal mass ejections can blast high energy particles through space, creating serious risks for astronauts and spacecraft.

Some of these eruptions produce solar proton events (SPEs), during which charged particles race toward Earth at speeds reaching 90% of t...

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