Which object would best be identified by a periodic doppler shift in a star's spectrum along with a dip in the stars light intensity?
a black hole
a nebula
a comment
a planet

The answer would be a planet. Planets revolve around stars, which means there will come a point where the planet is between the star and our field of vision towards the star. This point will be where the star's radiation will have the lowest intensity. As the planet moves, the intensity will change. The effect is comparable to a lunar or solar eclipse.

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