What makes us think Dark Matter and Dark Energy exist?
The areas discussed include:
| Background info | Doppler effect (sound and light); what is a photon; H energy levels; 21 cm line; look at red shift and blue shift |
| Dark matter: Zwicky & Rubin | Things move too fast in both galaxy clusters and within galaxies; what speed should things orbit? gravitational lensing; universe structure - nodes and filaments |
| Machos vs Wimps | Microlensing; detector experiments; CERN |
| MOND | Or is the law of gravity wrong? |
| Dark Energy | Cosmological red shift; Hubble's law; Type Ia supernovae; expansion seems to be accelerating |
| Other clues | CMB temperature variation; galaxy cluster structure; Big Bang critical density baryon % |
| What is Dark Energy | Haven't got much of a clue |
| Conclusion | How much of the universe is ordinary matter, dark matter and dark energy (we think) |