English subtitles for clip: File:Newtons Idee der Schwerkraft.webm

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At the time of Isaac Newton,

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the celestial bodies are set
into motion by the so-called ether,

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a substance that is supposed
to fill the entire universe.

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But no one has been able
to prove this substance.

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Newton recognizes:

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Instead of ether, there must be
a universal long-distance effect,

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which starts from the heavenly
bodies themselves:

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the heavier a body is,
the stronger its attraction.

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So the heavenly bodies
keep each other on their orbits.