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[[1914]] – Royal Australian Navy submarine '''HMAS ''AE1''''' vanishes while on combat patrol near Papua New Guinea.
* This begins one of Australia's longest naval mysteries: the sunken vessel will not be discovered for another 103 years. <br>
[[1958]] – Two rockets designed by the German engineer Ernst Mohr, the first German post-war rockets, reach [[Earth]]'s upper [[atmosphere]]. <br>
[[1959]] – The Soviet probe Luna 2 crashes onto [[Luna|the Moon]], becoming the first [[human]]-made object to reach it. <br>
[[2015]] – The first [[Human]] observation of [[gravity|gravitational wave]]s is made, a century after they were predicted. <br> * These gravity waves —ripples in the fabric of [[Space-time|spacetime]]— are believed to result from a cataclysmic event calculated as 1.3 billion light years away from [[Earth]].
<noinclude>[[Category:On This Day|258]]</noinclude>
