Cosmology Basics

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Cosmologist

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A scientist who studies the origin, structure, and evolution of the universe.

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Cosmos

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The entire universe, including all matter, energy, stars, galaxies, and space.

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Atom

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The smallest unit of matter that retains the properties of an element, made up of a nucleus surrounded by electrons.

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Nucleus

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The dense center of an atom, containing protons and neutrons.

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Proton

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A positively charged particle found in the nucleus of an atom.

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Neutron

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A particle with no charge (neutral) found in the nucleus of an atom.

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Electron

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A negatively charged particle that orbits the nucleus of an atom.

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Nuclear Fusion

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A process where two light atomic nuclei combine to form a heavier nucleus, releasing energy (e.g., in stars).

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Nucleosynthesis

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The process of creating new atomic nuclei, like hydrogen and helium, during the Big Bang or in stars.

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Opaque

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Something that blocks light, making it impossible to see through.