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This is where I start to give credit to a lot of Mars conspiracies. I know that the cameras on the Viking probes were tested and calibrated on Earth to give acc

This is where I start to give credit to a lot of Mars conspiracies. I know that the cameras on the Viking probes were tested and calibrated on Earth to give accurate colors, the probes themselves had color calibration chips on their hulls that the cameras could use for testing and recalibration, yet for some reason the sky and ground on mars was always shown as red hued (like in the 80s Total Recall movie), or maybe the sky was a little yellowish - until it wasn’t! Suddenly one day Mars had a blue sky and most of the rocks are grey, and only the soil is red. Not any real explanation I’ve ever heard, just oh by the way the sky on Mars is blue, in other news…

idlewords 4y ago
The color of the Martian sky depends heavily on how much dust is in the air, but it's generally orange-ish, while a dust-free sky would probably be black! People have scienced the hell out of this. For example see: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006JE002687 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/200... The question of what it would look like to human observers is another matter. A lot of photos from Mars are color adjusted to try to capture what we'd see if we went in person.