He appears to have considered the possibility of how to communicate with extraterrestrial life https://factslegend.org/physicist-max-planck-thought-of-a-practical-way-of-communicating-with-aliens/ But did he express any other views on this?

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    $\begingroup$ Nothing. It was a turn of phrase in his paper Über irreversible Strahlungsvorgänge (1899) that introduced his proposed 'natural units', now called Planck units:"It is interesting to note that with the help of the [above constants] it is possible to introduce units…which… remain meaningful for all times and also for extraterrestrial and non-human cultures, and therefore can be understood as ’natural units’… they must, when measured by other intelligences with different methods, always yield the same." $\endgroup$ – Conifold Apr 27 at 20:13

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