Concept
Matter–Antimatter Asymmetry
The puzzle of why matter survived annihilation.
The unexplained imbalance between matter and antimatter that allowed any matter at all to remain after early-universe annihilations.
Overview
The unexplained imbalance between matter and antimatter that allowed any matter at all to remain after early-universe annihilations.
See also
Baryon Asymmetry
Why there is matter and almost no antimatter.
Dark Matter Halo
A galaxy's enveloping cloud of invisible matter.
Cold Dark Matter (CDM)
Dark-matter candidate, dark-energy model, or related cosmological problem.
Warm Dark Matter (WDM)
Dark-matter candidate, dark-energy model, or related cosmological problem.
Hot Dark Matter (HDM)
Dark-matter candidate, dark-energy model, or related cosmological problem.
Mixed Dark Matter
Dark-matter candidate, dark-energy model, or related cosmological problem.