Astronomers can measure the speed of the stars in a binary system by measuring the _________ of the stars.
A) temperatures
B) luminosities
C) distance
D) colors
E) spectra

Question

Quizplus · Accepted Answer

The speed of stars in a binary system can be measured by studying their spectra. The Doppler effect causes a shift in the wavelengths of the light emitted by the stars, providing information about their relative speeds. By observing the change in the spectra over time, astronomers can determine the orbital period and velocities of the stars in the binary system.

Astronomers Can Measure the Speed of the Stars in a Binary