Viking 1 was launched on Aug. 20, 1975 and arrived at Mars on June 19, 1976. Viking 2 was launched Sept. 9, 1975 and entered Mars orbit on Aug. 7, 1976.

Science Named for Roman god of war, Mars isn’t very kind to visitors Originally published November 23, 2018 at 9:48 am Updated November 27, 2018 at 12:12 am ...