How Was the Dwarf Planet Pluto Discovered

question 116

Multiple Choice

How was the dwarf planet Pluto discovered?

• A) by prediction using Newton's laws to account for the deviations from uniform orbits of Uranus and Neptune
• B) by the infrared cameras on the IRAS spacecraft
• C) by Voyager spacecraft cameras, which were used between planetary encounters to survey the planetary system
• D) by searching photographs of the sky for an object that moved against the background of distant stars

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Definitions:

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