S6E1 Vocabulary

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Big Bang Theory

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The theory that all matter of the universe started in one gathered point then spread out after an explosion.

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Geocentric Theory

Back

An astronomical theory which describes the universe as a system where Earth is at the center and all other objects orbit Earth

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Heliocentric Theory

Back

The astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System.

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Milky Way

Back

The galaxy that contains our Solar System, characterized by its spiral shape.

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Spiral Galaxy

Back

A type of galaxy characterized by a flat, rotating disk containing stars, gas, and dust, and a central concentration of stars known as the bulge.

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Gaseous planets

Back

Planets composed mainly of gases such as hydrogen and helium, with a relatively small rocky core, also known as gas giants.

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Satellite

Back

An object that orbits a planet or another body larger than itself, which can be natural, like a moon, or artificial (man-made).

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Terrestrial planets

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Planets that are composed primarily of rocks or metals, with a solid surface, such as Earth, Mars, Venus, and Mercury.

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Gravity

Back

A natural phenomenon by which all things with mass or energy are brought toward one another, including planets, stars, and galaxies.

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Inertia

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The force that keeps planets moving forward, in a straight line.