Pluto
The American Clyde Tombaugh discovered the Pluto in the year 1930. Only 1978 succeeded the discovery of a moon, Charon, which circles the Pluto, from whose course could one the mass of the planet compute and also its diameter measure. It is shown that Pluto is the planet of the solar system lightest smallest with distance and. Many astronomers therefore assume that it was once a moon of the Neptun and was separated from this by an unknown event.
August Keller
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