OUTCOME
By the end of the lesson you will be able to describe how observational data from the early twentieth century revealed that the Universe is expanding
How do you measure the size of the universe?
Henrietta Leavitt's discovery of Cepheid variables was instrumental in our understanding of the distances of the universe
LEARNING TASKS
Explain
What are the different ways we use to measure the universe?
What are the limits to each of these methods?
What was the major breakthroughs discovered of Henrietta Leavitt and Edwin Hubble?
What is a Cepheid Variable and how did they allow astronomers to estimate distance of distant galaxies?
Evaluate
Review Qs 5.1