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

Question

Quizplus · Accepted Answer

During the early universe, for every billion antiprotons, there were slightly more than a billion protons. This slight excess of protons over antiprotons is what led to the matter-dominated universe we observe today, as matter and antimatter annihilate each other when they come into contact. This imbalance is crucial for the existence of the universe as we know it.

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

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