2.3 Evidence - World Science U

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2.3 Evidence

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2.9 Evidence

Question 1 of 1

1. Question
Before LIGO directly detected gravitational waves in September 2015, what was our best evidence for their existence?
- 1. The advance of Mercury's perihelion
- 2. Polarization of the cosmic microwave background
- 3. Fluctuations in the orbital radius of Earth
- 4. Observations of a binary system getting closer together
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