SUMMARY
On July 20, 1976, NASA's Viking 1 lander transmitted the first image of the Martian surface, a black-and-white photograph taken just 25 seconds after touchdown. This initial image served as a crucial health check for the lander, confirming its successful arrival and readiness to operate. The camera system, consisting of two facsimile cameras, scanned the landscape line by line using photodetectors and a pivoting mirror. Color images, which required multiple scans with red, green, and blue filters, were captured the following day, revealing the planet's rocky desert as envisioned.
TAKEAWAYS
The first image of Mars' surface was captured by Viking 1 on July 20, 1976.
This initial photograph was black and white, serving as a functional check for the lander.
Color images of Mars were captured by Viking 1 the next day, July 21, 1976.
The cameras used a line-by-line scanning method, similar to a fax machine, for image capture.