The total amount of light from a star-planet system drops when the planet goes behind the star.

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This phenomenon is known as transit and is commonly used to detect exoplanets. When the planet passes in front of the star, it blocks a portion of the star's light, causing a slight dip in the overall brightness detected by telescopes. As the planet moves behind the star, the total amount of light detected returns to its original level.

The Total Amount of Light from a Star-Planet System Drops