SME
Grade 12 Science
The Milky Way, galaxies, the Big Bang and the expanding universe
The main lesson, then each kind of problem it solves.
The Milky Way, galaxies, the Big Bang and the expanding universe
Main lesson
A galaxy’s redshift and distance
Use this for “A galaxy’s light is shifted to longer wavelengths, z = 0.03. How fast is it moving away, and how far is it?”
Space stretching: every galaxy moves apart
Use this for “Space doubles in size. How far does a galaxy 100 million light-years away move?”
Kinds of galaxies
Use this for “What do all galaxies have in common?” and for sorting galaxies by shape.
The history of the universe
Use this for “Put the events since the Big Bang in order. What is the microwave background?”