Gravitational Lensing and Dark Matter

8 questions to practice.

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What you will practice

1.What causes gravitational lensing?
2.What happens to light when it passes near a massive galaxy or galaxy cluster?
3.What is an Einstein ring?
4.Why is gravitational lensing useful for studying dark matter?
5.What is dark matter?
6.How can one distant galaxy appear as multiple images?
7.What is the main difference between our convex lens experiment and real gravitational lensing?
8.What can gravitational lensing help astronomers investigate?

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