any theory of the structure of the solar system in which Earth is assumed to be the center of it all
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dwarf planet
a small planetary-mass object that is in direct orbit of the sun
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Kuiper Belt
a ring of icy objects around the sun, extending just beyond the orbit of Neptune
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open cluster
groups of stars that were formed from the same molecular cloud within a galaxy or at its edge
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galaxy cluster
a structure that consists of hundreds or thousands of galaxies that are bound together by gravit
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asteroid belt
a torus shaped region in the solar system, located between Jupiter and Mars, that contains many solid, irregularly shaped bodies that are smaller than planets
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nebula
a huge cloud of dust and gases, mainly hydrogen and helium
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asteroid
rocky fragment that orbits around the sun and is too small to be a planet
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galaxy
a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
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star
a massive self-luminous celestial body of gas that shines using its own energy, made up of mainly hydrogen and helium
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Milky Way
galaxy that includes our solar system, has a spiral shape
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solar system
the gravitationally bound system of the sun and the objects that orbit the sun, either directly or indirectly
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The Pleiades
an open cluster located about 440 light years from Earth
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sun
the star at the center of our solar system
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heliocentric theory
theory that states that the sun is the center of the solar system and the planets and other bodies revolve around it
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Big Bang Theory
idea that the universe began as just a single point, then expanded to how large it is now, and is still expanding
