In the Very First Phase After the Big Bang, When

question 4

Multiple Choice

In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____.

• A) high-energy photons
• B) protons and antiprotons
• C) protons, neutrons, electrons, and positrons (anti-electrons)
• D) electrons, and positrons (anti-electrons)
• E) protons, neutrons, electrons

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