SME
Grade 12 Science · Problem type
The history of the universe
Use this for “Put the events since the Big Bang in order. What is the microwave background?”
Put in order
Put the events since the Big Bang in order.
1
?
2
?
3
?
4
?
5
?
6
?
7
?
Assumptions
•
The times are since the Big Bang, 13.8 billion years ago.
•
The microwave background is the oldest light we can see, stretched by expansion into microwaves.
Topic check
See what you know: 5 questions on this topic
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Related lessons
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.