Binary (double) stars can be detected by
A)being seen as two separate stars with a telescope.
B)one star traveling a wiggly proper-motion path across the sky.
C)one star dimming abruptly as another passes in front of it.
D)pairs of absorption lines seen in the spectrum of what appears to be one star.
E)All of the other choices are correct.

Question

Quizplus · Accepted Answer

Binary (double) stars can be detected using all the methods listed in the choices. Two separate stars can be seen with a telescope, one star can appear to travel in a wiggly path due to the gravitational influence of its companion, one star can dim as the other passes in front of it (known as an eclipsing binary), and pairs of absorption lines in a spectrum can indicate the presence of two stars orbiting each other. Therefore, all of the choices are correct.

Binary (Double) Stars Can Be Detected by