UniverseEverything that exists, including all physical matter and energy, the planets, stars, galaxies, and the contents of intergalactic space.
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All existing matter and space considered as a whole.
CosmologyThe science of the origin and development of the universe.
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The science of the origin and development of the universe or the universe as an ordered whole.
RelativityA theory from physics that space and time are interwoven into a single continuum known as space-time, whose curvature is caused by gravity.
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The dependence of various physical phenomena on relative motion of the observer and the observed objects.
QuantumThe smallest amount of a physical quantity that can exist independently, especially a discrete quantity of electromagnetic radiation. In quantum mechanics, a quantum refers to a single packet of light or other electromagnetic radiation.
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The smallest amount of a physical quantity that can exist independently.