: Astronomie: Milky Way

galactic and extragalactic astronomy > galaxy > spiral galaxy > barred spiral galaxy > Milky Way

Milky Way

The Milky Way Galaxy, our home galaxy, is a large barred spiral galaxy containing some 200 to 400 billion stars (possibly many more if brown dwarfs are included). Its barred structure, and the fact that its spiral arms are quite loosely wrapped, suggests that it is of type Sbc or SBbc in the Hubble galaxy classification scheme. Its main components are a disk, a central bulge, and a halo. Recent estimates put the total mass of the Milky Way Galaxy in the range one to two trillion solar masses, including a large but uncertain amount of dark matter in the dark halo. The Milky Way is the second largest member of the Local Group, after the Andromeda Galaxy. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/G/Galaxy.html)

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