Eclipsing binaries are the most useful, giving us sizes as well as masses of the pair.
Indicate whether the statement is true or false
Question 2
A star (no matter what its mass) spends most of its life:
A) as a protostar.
B) as a main sequence star.
C) as a planetary nebula.
D) as a red giant or supergiant.
E) as a T Tauri variable star.