If you have anti-matter do you have anti-gravity?..................
If you have anti-matter do you have anti-gravity?........
We haven’t discovered it...yet.
We also don’t understand the properties of Dark Matter, and why we believe it holds galaxies together.
We are still the equivalent of mice to men, in our true (not theoretical) understanding of the nature of the Universe.
https://www.physicsforums.com/threads/does-antimatter-have-a-negative-mass.408957/
Post 12 ,for an explanation of why not. :)