What is Astronomy?

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1.
Astronomy
2.
Space
3.
Stars
4.
Planets
5.
Moon
6.
Sun
7.
Galaxy
8.
Telescope
9.
Orbit
10.
Gravity
11.
Universe
12.
Sky
13.
Solar
14.
Eclipse
15.
Comet
16.
Asteroid
17.
Nebula
18.
Cosmos
19.
Light
20.
Observation