If matter and antimatter repel, how do we know other galaxies aren't made of antimatter?
13269
How would we tell antimatter galaxies apart?
68288
Anti-Matter Black Holes
129003
Is there any way to attract or repel neutrons?
41209
Does matter with negative mass exist?
16362
How does matter know to obey physical laws?
10778
How Does Dark Matter Form Lumps?
129234
Theory that gets rid of dark matter/energy
78910
What causes matter to initially rotate/spin/orbit?
70682
Mechanism of pair production and annihilation of matter
58986
Why doesn't dark matter affect planetary motion?
112830
Can Antimatter undergo nuclear fission/fusion?
66033
Why must fermions be antisymmetric?
136977
Is there any anti-gravity material?
61618
Could the missing antimatter lie outside the observable universe?
20811
Anti-Particle of Neutron
26354
Is anti-matter matter going backwards in time?
149215
Does a particle annihilate only with its antiparticle? If yes, why?