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Astronomy/Matter and antimatter

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Expert: - 8/13/2010


Question
After big bang , both matter and antimatter created in same ratio, than why we see only matter today?

Answer
They were created in almost, but not exactly the same ratio. Estimates are that the ratio was off by about a billionth of a percent or so, with the result that after everything else annihilated (essentially during the Big Bang), some material was left. That's what we now call all the matter in the Universe.

Astronomy

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Volunteer

Courtney Seligman

Expertise

I can answer almost any question about astronomy and related sciences, such as physics and geology. I will not answer questions about astrology and similar pseudo-scientific rubbish.

Experience

I have been a professor of astronomy for over 40 years, and am working on an online text/encyclopedia of astronomy.

Publications
Astronomical Journal, Publications of the Astronomical Society of the Pacific (too long ago to be really relevant, but you could search for Courtney Seligman on Google Scholar)

Education/Credentials
I received a BA in astronomy and physics and a MA in astronomy, both from UCLA. I was working on my doctoral dissertation when I started teaching, and discovered that I preferred teaching to research.

Awards and Honors
(too long ago to be relevant, but Phi Beta Kappa and Sigma Xi still keep trying to get me to become a paying member)

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