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[[1919]] – [[Albert Einstein]]'s theory of general relativity is tested by observations of the "bending of light" during a total solar eclipse. <br>[[1974]] – [[NASA]]'s ''Mariner 10'' becomes the first space [[probe]] to reach the planet [[Mercury]]. <br>[[1999]] – Space Shuttle ''Discovery '' completes the first docking with the [[International Space Station]].<br>