[ExI] silly question

[John Clark]

On Thu, Sep 5, 2019 at 4:52 PM William Flynn Wallace via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

On Mars the sky is only blue at sunrise and sunset because the atmosphere
is very thin and that's the only time Rayleigh scattering (named I think
after the famous British physicist Lord Scattering, but maybe not) becomes
significant. During most of the day the sky on Mars is pink due to all the
iron oxide in the air.

 John K Clark
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