Mariner 9 Launches - 1971 | Today In History | 30 May 17
NASA probe Mariner 9 took pictures of the Mars North Pole. Mariner 9 was the first spacecraft which orbited another planet. Mariner spent on the orbit of mars 349 days. It took more than seven thousand pictures which covered 85% of Mars' surface. The probe found remnants of rivers and inactive vulcanoes.