What are the greatest mysteries in Cosmology? Please comment on my list. 1 Complete explanation of black holes, what happens to time and space (worm holes?). 2 Process of symmetry breaking during initial stages of the of the big bang (includes matter/antimatter unbalance). 3 Source and characteristics of dark matter. 4 Source and characteristics of dark energy (cosmological constant). 5 Nature of gravity waves. 6 Is space and time discrete? 7 Source of ultra-high-energy cosmic rays. 8 Ultimate fate of the universe. Any more?