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Bima Sakti adalah galaksi spiral yang besar termasuk dalam tipe Hubble SBbc dengan total masa sekitar 10^12 massa matahari. galaksi ini memiliki 200-400 miliar bintang dengan diameter 100.000 tahun cahaya dan ketebalan 1000 tahun cahaya. Jarak antara matahari dan pusat galaksi diperkirakan 27.700 tahun cahaya. Di dalam galaksi bimasakti terdapat Planet Bumi tempat kita semua tinggal. Diduga bahwa di pusat galaksi, bersemayam lubang hitam supermasif atau dikenal dengan nama black hole. Sagitarius A dianggap sebagai lokasi lubang hitam supermasif ini.
Diperkirakan ada 4 spiral utama dan 2 yang lebih kecil yang bermula dari tengah galaksi. spiral utama tersebut yaitu :
- Lengan Norma
- Lengan Scutum-Crux
- Lengan Sagitarius
- Lengan Orion atau Lengan Lokal
- Lengan Perseus
- Lengan Cygnus atau Lengan Luar
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