Switzerland 2025 Our solar system Special sheet with 10 stamps MNH

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The universe of stamps looks out into space: this design is part of
the stamp set about our fascinating solar system. The designs in
the set include the eight planets, the sun and the moon.
The galactic stamps are available separately or as a set of all
ten designs together on a special sheet almost one metre wide.
There are only 12,742 copies. Why exactly that number?
It is equal to the average diameter of the Earth in kilometres.
Other little scientific factual nuggets about these celestial
bodies can be found on the back of the special sheet.
A couple in advance: a year on Mercury is 88 Earth days long,
a day on Venus lasts longer than a year. The set was created in
collaboration with the Department of Astronomy at the
University of Geneva and the University of Bern.