Sprinkled with stardust

Roof-scouring citizen scientist taught himself how to sift cosmic flecks from everyday Earth grit

Posted: March 20, 2017 at 1:52 a.m.

After decades of failures and misunderstandings, scientists have solved a cosmic riddle -- what happens to the tons of dust particles that hit the Earth every day but seldom if ever get discovered in the places that humans know best, like buildings and parking lots, sidewalks and park benches.

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