Question

Has an antimatter galaxy or other celestial body been observed?

Answer 1

I ask because it is much publicised that there is an odd imbalance between matter and antimatter in the universe: is it so unbalanced that we have only ever seen antimatter particles, and not bodies, in space?

Answer 2

yes it is observed.
Scientist made collisions many time with Proton and anti-proton in in Fermilab in Switzerland in the accelerator. Same as electron and with its anti-particle(Positron)

Here is one interesting fact about Dark matter too, that it is approx. 4 to 6 percent is composed of ordinary matter. It can be detected due to its gravitational field.

Regards,
2.5 years of experience in Cosmology and Astronomy.

Answer 3

We don't know of any antimatter galaxies or stars, but we wouldn't know if we were looking at one at a great distance because they would appear the same as regular matter!
That said, it's highly unlikely that any large bodies are antimatter, as this would mean that they are completely isolated from any ordinary matter, otherwise they would annihilate.

Answer 4

@Shayaan: the question was
"Has an antimatter galaxy or other celestial body been observed?"

You reply:
"yes it is observed."

and sign yourself off as someone experienced in Astronomy and Cosmology.

Are you really saying we have evidence of having observed a celestial body of anti-matter?