The Universe Vocabulary

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Universe

Back

The sum total of all matter and energy (only one exists).

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Big Bang Theory

Back

A theory that explains the expansion of the universe, stating that it expanded from a single point (singularity).

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Primordial nucleosynthesis

Back

The process in the early universe where light elements were created shortly after the Big Bang.

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Cosmic microwave background (CMB)

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The leftover radiation from the Big Bang that has cooled and expanded over time.

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Solar System

Back

A system consisting of a star (sun) and other objects orbiting the sun held together by gravity.

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Solar nebula

Back

A cloud of gas and dust that formed the sun and planets in the solar system.

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Planetesimal

Back

A small, rocky object formed in the early solar system from collisions, eventually forming planets.

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Terrestrial Planets

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The four inner planets, mostly made of metals and rocks: Mercury, Venus, Earth, Mars.

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Jovian Planets

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The four outer planets with rocky or metal cores and gaseous atmospheres: Jupiter, Saturn, Uranus, Neptune.

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Albedo

Back

The ability of surfaces to reflect sunlight or heat from the sun.