Poynting-Robertson effect

[poin-ting-rob-ert-suhn]

Poyn·ting-Rob·ert·son effect

[poin-ting-rob-ert-suhn]
noun Astronomy.
the slowing down and consequent spiraling inward of small particles orbiting the sun, due to their interaction with solar radiation.

Origin:
1955–60; after English physicist John H. Poynting (1852–1914) and U.S. physicist Howard P. Robertson (1903–61)
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Poynting-robertson effect is always a great word to know.
So is crescent. Does it mean:
the particular appearance presented by the moon or a planet at a given time
the figure of the moon in its first or last quarter, resembling a segment of a ring tapering to points at the ends
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