In the first moments of our universe, countless numbers of protons, neutrons and electrons formed alongside their antimatter counterparts. As the universe expanded and cooled, almost all these matter and antimatter particles met and annihilated each other, leaving only photons, or flashes of light, in their wake.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/UvJybqN
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