PhysicsCode 5054
The Universe
What this topic asks you to be able to do
- Know that our galaxy, the Milky Way, is about 100000 light-years in diameter and is only one among many billions of galaxies in the Universe
- Describe redshift as the increase seen in the wavelength of electromagnetic radiation given out by stars and galaxies that are moving away
- Know that light from far-off galaxies displays redshift, and that the more remote a galaxy is, the larger its observed redshift and the greater its speed of movement away from the Earth.
- Describe, qualitatively, in what way redshift gives evidence backing the Big Bang theory.