Stars and galaxy

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1.
Luminosity
2.
Constellation
3.
MilkyWay
4.
Andromeda
5.
Spiral
6.
DarkMatter
7.
Rotation
8.
Bang
9.
Hole
10.
Nebula
11.
Cosmic
12.
Gravity
13.
Year
14.
Telescope
15.
Observable