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Science

Can mass spontaneously form in space?

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The steady-state theory of cosmology assumed that matter was created spontaneously in space. Almost no one believes this today. However, a very high-energy photon can be transformed into matter, such as a positron and electron, creating new matter while conserving total mass-energy.

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Mass can spontaneously form in space, right now somewhere out there mass is most likely forming at this very moment due to dark energy, which causes the universe to expand.

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