Astronomers studying a transiting exoplanet can detect other nontransiting planets in the same system by
A) timing the interval between transits.
B) taking spectra of the star as the planet transits.
C) measuring microlensing of the transiting planet.
D) Directly imaging the planet during a transit.

Question

Quizplus · Accepted Answer

Timing the interval between transits can reveal variations caused by gravitational interactions with other planets in the system, indicating their presence even if they do not transit the star from our line of sight.

Astronomers Studying a Transiting Exoplanet Can Detect Other Nontransiting Planets