Contributions to the Mass and Energy of the Universe

• Photons (P ~ 0.01)

• Normal Matter (B ~ 0.04)

• Dark Matter (DM ~ 0.22)

• P + B+ DM ~ 0.27

• Unless we’re missing something, the universe should be open.

• (Hint: We’re missing something, but we need to learn more about the Big Bang to figure it out)

Notes: