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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