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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>
<noinclude>[[Category:On This Day|150]]</noinclude>
[[category:timeline]]
