Astronomical Methods
How we are to do astronomy: skygazing, telescopic observation, data processing - etc.
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Astrobiology
Astronomical methods of detecting and observing alien life
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Galaxies
Large gravitationally bound collections of celestial objects
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Stars
Luminant celestial objects powered by gravitational collapse or induced methods like fusion
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Planets
Large rounded objects which are neither stars nor remnants.
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Space and Media
Empty space and the inter-object media which fills the heavens.
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Orbits
On the mechanics of paths that objects follow in curved spacetime.
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