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Astronomy

How Plasma Instabilities Shape the Solar Wind

Quick fact

Some plasma instabilities in the solar wind can generate waves that efficiently scatter particles, acting like friction in a nearly collisionless medium, gradually decelerating the wind over millions of kilometers.

Why this is interesting

The solar wind races away from the Sun at over a million miles per hour, but something in the empty space between planets is constantly reshaping it. What invisible forces are at work?