According to NASA, the universe is getting bigger every second. The space between galaxies is stretching, like dough rising in the oven.
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Hubble measurements suggest a faster expansion rate in the modern universe than expected.
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Scientists believe that the existence of dark energy and the amount of repulsion it displays compared with dark matter is what's causing our universe to expand.
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Edwin Hubble's observations of the expanding universe in the 1920s marked the beginnings of the big-bang theory.
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The rate of expansion of the Universe is expressed by a quantity called "the Hubble constant".
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According to inflation theory, the majority of the mass-energy of the Universe came from the energy of the vacuum.
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