Absolute zero: The lowest possible temperature, at which substances contain no heat energy.
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Acceleration: The rate at which the speed of an object is changing.
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Anthropic principle: We see the universe the way it is because if it were different we would not be here to observe it.
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Antiparticle: Each type of matter particle has a corresponding antiparticle. When a particle collides with its antiparticle, they annihilate, leaving only energy.
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Atom: The basic unit of ordinary matter, made up of a tiny nucleus (consisting of protons and neutrons) surrounded by orbiting electrons.
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小辞典 Glossary
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