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A stellar wind is a continuous flow of gas that streams outward from a star into space. This matters because stellar winds can shape the environments around stars, affect nearby planets and objects, and influence how stars lose mass over time.
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This image shows the wind from the star LL Orionis generating a bow shock (the bright arc) as it collides with material in the surrounding Orion Nebula. A stellar wind is a flow of gas ejected from the upper atmosphere of a star. It is distinguished from the bipolar outflows characteristic of young stars by being less collimated, although stellar winds are not generally spherically symmetric.
Different types of stars have different types of stellar winds.