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the golden record on Voyager spacecraft.

I suppose the units are similar to natural units (speed of light=Planck constant=1), except that the basic unit is not GeV:

The unit of energy is the energy difference between two lowest states of hydrogen atom. I think the unit of frequency can be calculated from the unit of energy using Planck constant. The unit of time follows from unit of frequency. Unit of distance is the distance traveled by light in one unit of time.

Unit of mass follows from unit of energy and mass-energy equivalence.

Questions:

1. Is the above consideration correct?

2. How big is the energy difference between two lowest hydrogen energy states?

3. Does the length of the line between scheme of two hydrogen energy states on the record have any meaning? How long is it? Is it equal to the unit of distance?

4. Do you know any good links to information about this topic?