A key test that will make sure that the dimming of light from a star is caused by a planet as detected by the Kepler is that the dimming would

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The dimming of light from a planet as detected by the Kepler would repeat with a definite period, indicating the planet's orbit around the star. This is the key test that confirms the presence of a planet. Occurring simultaneously with multiple systems or being at least half of the brightness of the star may be indications of a planet, but they are not definitive tests. Confirming with ground-based telescopes is also important, but it is not the key test for detecting a planet using the Kepler.

A Key Test That Will Make Sure That the Dimming