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[[1910]] – A paper on [[Gamma radiation|cosmic radiation]] is published, suggesting that [[Earth]] is under constant radiation bombardment from outer space, and from sources other than [[Sol|the sun]]. <br>
[[1968]] – The Soviet ''Zond 5 '' spaceship is launched, becoming the first [[spacecraft ]] to fly around [[Luna|the Moon]] and re-enter the [[Earth]]'s [[atmosphere]]. <br>
[[1998]] – [[Jupiter]]'s planetary rings are declared to be made of dust from the impacts of cosmic bodies that crashed into the [[planet]]'s [[moon]]s. <br>
<noinclude>[[Category:On This Day|259]]</noinclude>
[[category:timeline]]
