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Crater counts on Pluto, Charon show small Kuiper Belt objects surprisingly rare

Using New Horizons data from the Pluto-Charon flyby in 2015, scientists have indirectly discovered a distinct and surprising lack of very small objects in the Kuiper Belt. The evidence for the paucity of small Kuiper Belt objects (KBOs) comes from New Horizons imaging that revealed a dearth of small craters on Pluto's largest satellite, Charon, indicating that impactors from 300 feet to 1 mile (91 meters to 1.6 km) in diameter must also be rare.

from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190228141252.htm
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