BOSTON — For the first time, astronomers have detected an astrosphere around a star like the sun.
This bubble of hot gas is blown by a star’s stellar wind, a constant stream of charged particles every star emits. The sun’s version of this bubble, called the heliosphere, marks the edge of our solar system and protects the planets from most of the high-energy cosmic rays that zip about the galaxy (SN: 12/10/18, SN: 10/15/09).
Astronomers have seen analogous bubbles around hot stars, dying stars and baby stars — but not sunlike stars.
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