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Astronomer

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A scientist who studies objects in space, such as black holes, galaxies, moons, planets, stars, etc.

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Astronomy

Back

The study of celestial objects, space, and the universe as a whole.

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Big Bang Theory

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A theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago.

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Galaxy

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A large grouping of stars in space.

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Geocentric Model

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A model showing Earth located at the center of the universe.

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Heliocentric Model

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A model showing the Sun as a fixed point in the center of the Universe, with objects revolving around it.

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Milky Way Galaxy

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The galaxy in which Earth and the Sun are located.

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Orbit

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A curved path followed by a satellite as it revolves around the object.

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Solar System

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A star and the group of planets and other celestial bodies that are held by its gravitational attraction and revolve around it.

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Universe

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All of space and the matter space contains.