What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? a. they explained why objects appear to have color. b. they were able to find the orbit of a comet and predict the year of its return. c. they discovered the three newest planets--uranus, neptune, and pluto d.

The correct option is C

Edmond Halley discovered that the comet that had been sighted in 1682 was the same one that had previously visited the earth in 1066, 1305 and 1380.

Based on the physical laws and especially the mathematical discoveries of Isaac Newton, Halley calculated that the orbit of this comet was not parabolic as was believed until now but was elliptical of great amplitude. In this way he correctly predicted that he would return to earth in 1758.

Alexis Claude Clairaut demonstrated great advances related to the orbit of the moon, the movements of comets and disturbances in them caused by the planets and in 1759 calculated the perihelion of Halley's comet.

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