A binary star is a pair of stars that orbit around each other. By detecting this orbital motion, and using Kepler's laws and the law of gravitation, one can directly measure the stars' ____.
A) temperatures
B) luminosities
C) masses
D) distances

Question

Quizplus · Accepted Answer

By observing the orbital motion of binary stars and applying Kepler's laws and the law of gravitation, astronomers can calculate the masses of the stars.

A Binary Star Is a Pair of Stars That Orbit