From Up Here Astronauts See The Aurora Below Their Feet

Earth's magnetic field extends 65,000 kilometers into space, acting as an invisible force field against the Sun's constant bombardment. Mars lost its magnetic field billions of years ago and the Sun slowly stripped away its atmosphere and oceans as a result. That is exactly what would happen to Earth without it. Astronauts on the ISS are actually outside most of this protection and receive radiation doses 10 times higher than people on the ground

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