The knowledge exchange

Space and astronomy

How We Know the Universe Is Expanding

You'll explain how astronomers measured the universe's expansion using light from distant galaxies.

45 minLevels
L0L1L2L3L4L5

Lessons

1 · 3-minute lesson3 min

Recognize why light from distant galaxies appears redder than expected

Available

2 · Coming soon

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3 · Coming soon

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4 · Coming soon

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5 · Coming soon

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Start the 3-minute lesson