: Astronomie: Poynting-Robertson force

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Poynting-Robertson force

The Poynting–Robertson effect, also known as Poynting–Robertson drag, named after John Henry Poynting and Howard P. Robertson, is a process by which solar radiation causes a dust grain orbiting a star to lose angular momentum relative to its orbit around the star. This is related to radiation pressure tangential to the grain's motion. This causes dust that is small enough to be affected by this drag, but too large to be blown away from the star by radiation pressure, to spiral slowly into the star. In the case of the Solar System, this can be thought of as affecting dust grains from 1 μm to 1 mm in diameter. Larger dust is likely to collide with another object long before such drag can have an effect. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Poynting%E2%80%93Robertson_effect)

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