What must be true in order for astronomers to be able to use the Doppler technique to determine a planet's mass?
A)The planet's orbit must be seen nearly face on.
B)The planet must have a very low mass.
C)The planet must have a very eccentric orbit.
D)The planet's orbit must be viewed nearly edge on.

Question

Quizplus · Accepted Answer

In order to use the Doppler technique to determine a planet's mass, astronomers must observe the planet's orbit from Earth and measure the slight wobble of the star caused by the gravitational pull of the planet. This wobble is most easily detected when the planet's orbit is viewed nearly edge on, allowing for the greatest change in the star's radial velocity.

What Must Be True in Order for Astronomers to Be