Launched on November 28, 1964, Mariner 4 performed the first successful flyby of the planet Mars returning the first pictures of the Martian surface.
It was the fourth in a series of spacecraft used for planetary exploration, collecting photos and samples from Mars surface.
This flight returned the first pictures of the Martian surface.
These represented the first images of another planet ever returned from deep space; their depiction of a cratered, seemingly dead world largely changed the view of the scientific community on life on Mars.
This was a massive step for scientists who until this point were still considering the possibility of life on Mars.
Mariner 4 was launched and designed to conduct close-up scientific observations of Mars and to transmit these observations to Earth.
The total cost of the Mariner 4 was a staggering $83.2 million.
The total research, development, launch and support costs for the Mariner series of spacecraft (Mariners 1 through 10) was approximately $554 million.
However, these images were the successful mission that probed hope for further exploration and photographic evidence of other planets throughout the solar system. Just 5 years later Apollo 11 would be the first manned mission to successfully land on the moon.