Date of discoveries
The 1st Viking went up to mars on the 20th of August 1975 to the 9th of September 1975.
What was the discoveries
To observe changing seasons.
Showed the opposites of what planner wanted a deeply river bed.
Form orbit the the Vikings provided a window into. Mars part pictures of volcanoes and ancient channels where floods may have roared in the past.
Mars river beds
Volcanos on mars
Saturn v rocket once used to hoist astronauts to the moon and camera for picture.
Under understanding of the soler system
That it could be water on mars.