Crossword-Solution: MICROMETEORITES 15 letters, 1 clue 🏆 scrabble score: 21

Hydrogen gas, radiation belts, cosmic particles, solar disturbances of unknown nature, micrometeorites--and, from Pioneer V, proof of a 5-million ampere electromagnetic ring centered about 40,000 miles away.[82] The director of the Smithsonian Astrophysical Laboratory in Cambridge, Mass.,[83] has said that more and more startling astrophysical information was gathered during the first few weeks of the space age than had been accumulated in the preceding century.

You know, of course, that we are constantly being bombarded by cosmic dust, the micrometeorites that always prove troublesome to the Earth satellites and space platforms.