What property of a star can almost never be determined unless it is a member of a binary star system?
A)Distance
B)Luminosity
C)Mass
D)Chemical composition

Question

Quizplus · Accepted Answer

Mass is the property of a star that can almost never be determined unless it is a member of a binary star system. This is because there are different methods to measure other properties of a star like distance, luminosity, and chemical composition, but measuring mass requires observing the gravitational interaction between two stars in a binary system.

What Property of a Star Can Almost Never Be Determined