I love rediscovering cool things. I'm sure I learned, at some point, that the Soviet Union had once sent probes to land on the surface of Venus. But I had completely forgotten this fact until today.
This photo comes from Venera 9, which landed on Venus on October 22, 1975. The lander remained operational for 53 minutes, which isn't bad considering we're talking about a planet with hydrochloric acid and hydrofluoric acid in the atmosphere, and a surface temperature (as measured by Venera 9) of 905° F.
The photo — at three different phases of processing — comes from the website of Don Mitchell, an enthusiast of Soviet space history. Mitchell did the processing that resulted in the clear, bottom image in this stack.
The upper image is the raw 6-bit data. The center images include the telemetry brust replacements, with remaining bursts blacked out. The 6-bit values have been transformed to linear brightness, using the published photometric function of the camera, and then converted to sRGB standard form (gamma 2.2). In the final version, I filled in missing regions, using Bertalmio's inpainting algorithm.
• Read more about these photos at Don Mitchell's website
• Read more about the Venera landers and how they survived on Venus
Thanks to OMG Facts for reminding me of this cool bit of history