Astronomy Concepts

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Big Bang

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A theory that explains the origin of the universe as a massive expansion from a singular point.

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Geocentric Model

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An astronomical model that places Earth at the center of the universe.

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Heliocentric Model

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An astronomical model that places the Sun at the center of the solar system.

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Solar System

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The collection of eight planets and their moons in orbit around the Sun, along with smaller bodies such as asteroids, meteoroids, and comets.

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Universe

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All existing matter and space considered as a whole; the cosmos.

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Elliptical Galaxy

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A type of galaxy having an ellipsoidal shape and a smooth, nearly featureless brightness profile.

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Galaxy

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A massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter.

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Irregular Galaxy

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A galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy.

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Milky Way

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The galaxy that contains our Solar System.

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Spiral Galaxy

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A galaxy characterized by a central bulge and spiral arms.