- The full moon in September is called the âHarvest Moonâ, but itâs just a regular full moon (in September).
- The moon closer to the horizon looks red because thereâs more atmosphere youâre looking through, and red light isnât as scattered by it.
- Cosmic Microwave Background Radiation: microwave light in all directions thatâs left over from the Big Bang.
- Evidence for the Big Bang â the theory predicts this radiation, and they found it.
- The data support not only an expanding universe, but also accelerated expansion of the universe.
- The universe is expanding at a rate greater than the speed of light.
- You would predict that the center of galaxies should rotate much faster than the edges. But thatâs not whatâs observed. So we explain that with dark matter â thereâs 10x more mass than we can observe.
- Galaxies are expanding from each other, but stars and planets arenât (the scale is too small).
- Galaxies start as discs because they collapse and then spin out.
- Other shapes (like footballs) are formed from merging galaxies.