Changes

[[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>