An astronomer is trying to detect an exoplanet via the astrometric method. Which of these changes to a particular planet will make it easier to detect, if everything else about the planet is unchanged?
A) increasing its radius
B) increasing its mass
C) increasing its orbital period
D) All of these are correct.

Question

Quizplus · Accepted Answer

The astrometric method of detecting exoplanets relies on observing the tiny wobbles in a star's position caused by the gravitational pull of an orbiting planet. Increasing the mass of the planet enhances this gravitational effect, making the star's wobble more pronounced and the planet easier to detect. Changes in the planet's radius or orbital period do not directly affect the star's wobble in a way that would make detection easier using this method.

An Astronomer Is Trying to Detect an Exoplanet Via the Astrometric