Determining the shape of Milky Way Submitted by omg-whats-this t3_zv1i7q on December 25, 2022 at 4:42 PM in space 14 comments 16
BigChiliVerde t1_j1o1179 wrote on December 26, 2022 at 12:11 AM The 21cm emission line of neutral hydrogen was used to map the interstellar hydrogen gas clouds in the early 1950's. This gave us the first detailed images of the spiral structure of the Milky Way. Permalink 9
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