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Universe A-Z

Accelerating Universe   A theory that the Universe is expanding at an increasing speed. This may be caused by a force called dark energy, which could overcome the gravitational force that pulls galaxies towards one another. 

Atom   A basic building block of matter. An atom consists of a nucleus made up of subatomic particles called protons and neutrons, surrounded by a number of electrons. All of these particles were created in the first seconds of the Big Bang

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