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Here is an image of an antiproton beam going through a bubble chamber: It is a representative picture of what happens when an antiproton meets a proton : annihilation into many particles which further interact with the bubble chamber matter electromagnetically and will finally decay into neutrinos, muons, which will escape the chamber due to weak ...

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Here are a few more points to add on to Dmitry's excellent answer. A chain reaction requires amplification, in the sense that one reaction produces products that then initiate an average of $n$ further reactions, where $n>1$. For example, uranium fission produces neutrons, and if the piece of uranium is big enough and sufficiently enriched, those ...

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From the article to which you linked: The cloud shines brightly in gamma rays due to a reaction governed by Einstein’s famous equation $E=mc^2$. Negatively charged subatomic particles known as electrons collide with their antimatter counterparts, positively charged positrons. So you see, the very reason that we know it's a cloud of antimatter is ...

1

According to Thorne (Black Holes and Time Warps) all matter that approaches the black hole singularity is reduced to a common degenerate form - matter and anti-matter alike. The way I interpret it, matter ceases to retain any resemblance to what existed outside the black hole. The attributes that distinguish matter and anti-matter are stripped away. ...

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IF Andromeda were antimatter, or any galaxy in general, we would be able to notice the huge amount of energy from colliding matter and antimatter galaxies. As we don't, the only explanation is (while still thinkin' "Andromeda is antimatter") that matter and antimatter would repel each other instead of having normal gravity. However, Andromeda IS going to ...

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If there were a matter-antimatter boundary, we would observe gamma radiation from the annihilation events on the boundaries. We do not observe such radiation events.

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It's not really that antiparticles are travelling backwards in time. But mathematically speaking, an antiparticle travelling forwards in time is indistinguishable from the corresponding particle travelling backwards in time. They're just different ways of understanding the same physical situation.

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