SUNSET: 
Planetary Society Grants Help Astronomers Track Dangerous Asteroids
There are some 25,000 near-Earth asteroids with diameters more than 140 meters. Amateur astronomers can find them — and the Planetary Society can help.
There are some 25,000 near-Earth asteroids with diameters more than 140 meters. Amateur astronomers can find them — and the Planetary Society can help.
By: Jason Davis May 9, 2019
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