Earth does not have the this perspective on all binary systems, but those systems from which we can observe eclipses give us valuable information. So even though both stars cannot be seen separately through the telescope, the sp ectrum of the system shows that there are two stars there and that they are orbiting each other. One important feature of a binary star's spectrum is that the two stars' spectra may be Doppler shifted . Continue on to the next page of the lab to learn about Doppler shift. Not all stars that appear next to each other in the sky are orbiting each other.
Some stars just appear next to each other because they lie along the same line of sight.
They just look cool.