| 1 |
Observed time delay of radar signals bounced off planets or spacecraft during superior conjunction
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so that signals are affected by close passage to sun
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| 2 |
Observed decrease in period of binary pulsar discovered by Hulse and Taylor(1975)
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Consistent with energy decrease due to radiation of gravitational waves predicted by general relativity
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| 3 |
A laser monitors distance between Moon and Earth showing that they both have same acceleration due to sun with a precision of 7 parts per ten trillion(1010)
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Tests Equivalence Principle
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