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Why were the mass and density of Pluto unknown until Charon was found?

ppk

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12 years ago

Why were the mass and density of Pluto unknown until Charon was found?

Why were the mass and density of Pluto unknown until Charon was found?

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duddy

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#1

Staff Member

12 years ago

Pluto is so distant that its disk was not resolved well, and it had no discernable gravitational influence on Uranus and Neptune (Lowell's prediction was just luck). But Charon's orbit let us find the mass of both objects, and the series of eclipses allowed us to calculate the sizes of both bodies with great accuracy.

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