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UNIVERSE, Before the Big Bang, the arbitrary quantum concept of "…

- - - - SPIRAL GALAXIES
        
        Bar spiral galaxies are a subtype of spiral galaxies. Milky way is a bar spiral galaxy!
      - ELLIPTICAL
    - - Star Systems
        
        Stars
        
        Stars are giant spheres of fire made mostly out hydrogen, helium and lithium
        
        Stars are formed from Nebulas
        
        Then, depending on the size of the star, the star can go one of two paths:
        
        Large mass stars
        
        Red supergiant
        
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        Low mass stars
        
        Red giant
        
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        Solar System
        
        Earth!
        
        Space observation
        
        Since our eyes aren't strong enough to see things thousands of kilometers away, we need specific tools
        
        Telescopes
        
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        Satellites
        
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        Probes
        
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        Constallations
        
        Constallations are groups of bright stars that look like they are close in the night sky when observing from Earth. They form shapes and have names that usually don't actually resembe the shape, but instead have a huge greek epic detailing the backstory of the satellite.
        
        Light Pollution
        
        Light pollution is unnecessary light aimed towards the sky, which makes it difficults to make observations and can even confuse animals.
        
        Our Sun
        
        Planets
      - Black holes
      - Nebulae
        
        Nebulae are huge hot clouds of dust and gas