During the First One-Ten-Thousandth of a Second (10^-4 S) of the Life

question 33

Multiple Choice

During the first one-ten-thousandth of a second (10^-4 s) of the life of the universe, antiprotons were very common. For every billion antiprotons, how many protons were there?

• A) exactly 1 billion since protons and antiprotons were created in equal numbers
• B) slightly more than 1 billion, thus producing the matter seen today
• C) totally unknown number since the early universe was opaque and astronomers cannot see what conditions were like then
• D) 10 billion, thus producing the dark matter seen today

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