This Way to the Universe
summary
James Webb Telescope finds spiral galaxies nearly 14 billion years old and cosmology now quantifies the universe as roughly comparable fractions of atoms dark matter and dark energy, differing by a factor of a few. Evidence comes from galactic rotation speeds, gravitational lensing, the cosmic microwave background and supernova distance measures. The bullet cluster directly separates gas from the mass mapped by lensing, showing collisionless matter in a dark matter halo around the Milky Way, and models now explore whether dark matter has its own interactions.
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chapters (7)
- 0:00Introduction to cosmology
- 2:05The cosmic pie chart
- 4:47What is dark matter?
- 8:27Understanding dark energy
- 10:45Evidence for dark matter
- 11:40Distribution of dark matter
- 12:42Current research and outlook
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