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Questions for Discussion: Hubble's Expanding Universe
- What is the relationship between a Cepheid star's luminosity, its apparent
brightness, and its period? How did these stars help Hubble learn about the size of universe?
- What evidence is there that the universe is expanding?
- How did Hubble deduce that some galaxies are moving away from our galaxy
and some are moving toward it?
- How do engineers help astronomers learn more about space?
- Why was the Hubble telescope taken into space rather than being used on Earth?
