Andromeda is made of antimatter. Am I wrong? Why?
13269
How would we tell antimatter galaxies apart?
144771
Is there any thing composed of elementary particles in this world that is not 3 dimensional?
11613
What kind of matter are black holes made of?
27820
What's wrong with this experiment showing that either FTL communication is possible or complementarity doesn't hold?
105369
Why does orbiting matter form an accretion disk?
99150
Is there evidence of dark matter in our galaxy?
54968
Confusion about Length Contraction (ex in Muon decay)
70682
Mechanism of pair production and annihilation of matter
49627
What could explain the presence of Technetium in the spectral lines of stars?
50700
Could Dark Energy just be particles with negative mass?
15029
How do we know that the nucleus isn't a quark-gluon plasma?
100799
How distorted does the Andromeda Galaxy appear to us due to the speed of light?
41209
Does matter with negative mass exist?
85898
What is space made of?
38454
Do anti-photons exist?
114934
Bootstrap Paradox in Interstellar
67979
Why are neutrinos ruled out as a major (or even sole) component of dark matter?