Before the Viking spacecraft landed on Mars in 1976, it was thought that the atmospheric pressure of Mars was somewhere between 0.4 PSI and 4.4 PSI. When the Viking spacecraft landed, the pressure sensor appeared to indicate that the atmospheric pressure on the surface of Mars was 0.09 PSI.
There was a software error in the conversion of pressure sensor data, where Pa and hPa were not considered as different units, although they differ by a factor of 100. This implies that Mars has an atmospheric pressure of 9 PSI. This has rather large implications for our understanding of physics, and may be an explanation why most spacecraft attempting to land on Mars fail, and the ones that do land are many miles from the intended landing location.
The question I asked myself a few years ago and still can not find a better answer is:
The sky is not black when viewed from Mars rovers.
At 100,000 feet on Earth, the pressure is similar to the currently accepted pressure on Mars, and the sky is black.
If the diffuse light on Mars is from the dust, what is holding up the dust?
Why does it matter if the pressure on the surface of Mars is 60% of the pressure on the surface of Earth?
We could use aircraft on Mars.
We could roam the planet of Mars without spacesuits using just warm clothing and rebreathers.
The mathematical equations of physics fit together in a nice way that currently can not be done.
A strange claim, but there's some work there which superficially seems to back it up. Maybe someone with a bit of relevant knowledge can refute? I guess whether or not the Perseverance helicopter works will be a good litmus test - aerodynamic surfaces would perform quite differently with an atmosphere 100 times more dense than NASA expects.
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