Question

Select all that apply.

Answer 1

Answer:

composition of stars

surface temperatures

Explanation:

A spectrograph is used by astronomers to find to the composition of stars and surface temperature.

The emission or absorption spectra tells the composition of stars- the elements present in it. Elements absorb/emit particular wavelength.

Using the peak wavelength of from the spectrum obtained, surface temperature can be calculated using Wein's law.

Spectrograph is not used to measure the distance but the motion of the stars. The motion is indicated by red-shift and blue-shift.

Answer 2

I found that it was: Distance to stars, Brightness of stars and Composition of stars. Hope this helps!