The Sun’s Motion in the Universe

(Slate::Bad Astronomy) – Phil Plait:

We’re not the only object in the galaxy in motion! All that galactic gas is orbiting the galactic center as well. Stuff near the center is orbiting faster than we are, and stuff farther out slower. The blue gas on the right is inside our orbit, moving faster than we are, so it’s catching up to us, approaching us. But the gas colored green is outside us, moving more slowly, so we’re leaving it behind. …

bad_astronomy 2016/10/27 hydrogen_map

Hydrogen in Milky Way


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