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<blockquote data-quote="Umbran" data-source="post: 6686147" data-attributes="member: 177">To our first best guess, the Big Bang should have created just as much matter as antimatter - particles are produced in matter-antimatter pairs.&nbsp; So, yes, we should see a lot of antimatter around, but don't.&nbsp; Why?The answer is:&nbsp; We don't know yet.&nbsp;&nbsp; There are a few hypothesis.&nbsp; One is that, back in the very early universe, when matter and anti-matter should have been made in equal amounts, there was some asymmetry we don't currently see that led to more matter than anti-matter being created.&nbsp; Then, there was a frenzy of matter and anti-matter annihilating, leaving us with the slight excess of matter we see now.Another is that there's a *slight* difference in the decay rates of matter and anti-matter.&nbsp; If anti-matter decayed a bit more quickly than matter, we might then see an excess of matter today.A third is that the Big Bang did create equal amounts of matter and anti-matter, but they are in regions widely separated - this leaves us with a problem of why stuff was created in uneven bubbles, instead of evenly.&nbsp; Part of that may be answered by the Anthropic Principle - in order for us to see a universe, it must be a universe we can live in.&nbsp; If the universe had just as much of both, they'd all annihilate, and leave nothing for us to be made out of!&nbsp; So, while move of the entire universe may have been created with a pretty even distribution, maybe there was at least one statistical anomaly (in an infinite universe, there *will* be some anomalies) where the matter and antimatter were created slightly separated, and we live in one.&nbsp; If we didn't, we wouldn't live at all....<a href="https://en.wikipedia.org/wiki/Baryon_asymmetry" target="_blank">https://en.wikipedia.org/wiki/Baryon_asymmetry</a></blockquote>

[QUOTE="Umbran, post: 6686147, member: 177"] To our first best guess, the Big Bang should have created just as much matter as antimatter - particles are produced in matter-antimatter pairs. So, yes, we should see a lot of antimatter around, but don't. Why? The answer is: We don't know yet. There are a few hypothesis. One is that, back in the very early universe, when matter and anti-matter should have been made in equal amounts, there was some asymmetry we don't currently see that led to more matter than anti-matter being created. Then, there was a frenzy of matter and anti-matter annihilating, leaving us with the slight excess of matter we see now. Another is that there's a *slight* difference in the decay rates of matter and anti-matter. If anti-matter decayed a bit more quickly than matter, we might then see an excess of matter today. A third is that the Big Bang did create equal amounts of matter and anti-matter, but they are in regions widely separated - this leaves us with a problem of why stuff was created in uneven bubbles, instead of evenly. Part of that may be answered by the Anthropic Principle - in order for us to see a universe, it must be a universe we can live in. If the universe had just as much of both, they'd all annihilate, and leave nothing for us to be made out of! So, while move of the entire universe may have been created with a pretty even distribution, maybe there was at least one statistical anomaly (in an infinite universe, there *will* be some anomalies) where the matter and antimatter were created slightly separated, and we live in one. If we didn't, we wouldn't live at all.... [url]https://en.wikipedia.org/wiki/Baryon_asymmetry[/url] [/QUOTE]

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