How did Clyde Tombaugh discover Pluto?   a By looking for faint objects that were occasionally covered up by Uranus and Neptune   b By carefully analyzing irregularities in the orbits of Uranus and Neptune, and using those calculations to predict exactly where Pluto would be seen   c By making very careful observations of the sky with the unaided eye, to look for faint objects the ancient astronomers missed   d By comparing photographs taken on different nights, to look for any faint objects that moved relative to the stars

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