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

question 3

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 we see today
• C) a totally unknown number since the early universe was opaque and we cannot see what conditions were like then
• D) 10 billion, thus producing the dark matter we see today

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