Astronomy, The study of the moon, stars, and other objects in space, Astronomer, A scientist who studies the stars and other objects in the sky, Stars, Huge balls of hot, glowing gases that produce their own heat and light., Sun, The star at the center of our solar system; average compared to other stars., Star classification, Stars are classified by their brightness by their size, distance, temperature (color), star temperature, the color tells us the temperature, magnitude, the brightness of a star, universe, everything that exists, galaxy, a group of billions of stars, objects that orbit those stars, dust and gases in space held together by gravity, spiral galaxies, a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern, barred spiral galaxies, A spiral galaxy with a central bar-shaped structure composed of stars., irregular galaxies, A galaxy that does not have a particular shape, elliptical galaxies, a galaxy that looks like round or flattened balls and have little dust and gas between the stars. Most common., constellation, A group of stars that form a pattern in the sky

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