Question

What elements are stars mostly made of?

A. Hydrogen and lithium
B. Carbon and iron
C. Hydrogen and helium
D. Carbon and oxygen

How do we know this?

A. By taking direct samples of the stellar wind
B. By measuring the overall color of a star
C. By analyzing the strength of lines in stellar spectra
D. By analyzing the number of lines in stellar spectra

Answer 1

C

The stars are made up of hyrodgen and helium because It is required in the thermal nuclear fusion inside the core where hydrogens reacts with each other to give helium.