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Structure of the Universe Galaxies are clusters of millions and billions of stars. They are constantly moving due to the expansion of the universe. The further they are - i.e. closer to the edge of the universe - the faster they move. Stars are spheres of inte...

Temperature Thermal equilibrium describes the equal transfer of thermal energy in and out of a system. The absolute scale of temperature is Kelvin. You convert from Celsius to Kelvin by adding 273 to the Celsius number. This is because -273 Celsius (0K) is abs...