Re: Galaxies and antimatter

"Ray Johnstone" <ray@xxxxxxxxxxxx> wrote in message
news:nae291hd3pqik2i4h56t9ehmvqkno3kvbt@xxxxxxxxxx

> What is the evidence that other galaxies are made
>of matter rather than antimatter?

A pure anti-matter galaxy ? Don't know. Not directly
from light. A photon is it's own anti-particle.

A mixture ? We would see a lot of 0.511 MeV gammas
from electron-positron annihilation.

[Old Man]


.

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