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HI4PI maps Milky Way's neutral hydrogen

Milky Way

Astronomers Map Milky Way in Incredible Detail

Astronomers have mapped neutral atomic hydrogen, which profuses the space between stars, in unprecedented detail to create a beautiful radio-wavelength portrait of the Milky Way.

Milky Way Galaxy, NASA / JPL-Caltech

Astronomy Questions & Answers

What percentage of our galaxy’s stars move in retrograde orbits?

Do astronomers have any idea what percentage of our galaxy’s stars move in retrograde orbits? The short answer is yes, a very small percentage. But the long answer is more interesting. First, let’s agree what we mean by “retrograde.” If you were to look down on the solar system from…

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