Answer:
C) mass is the correct answer.
Explanation:
A binary star is made up of two stars revolving a common core of mass. Binary star systems give the most reliable means for scientists to find out the mass of a star.
Binary stars can be used to calculate the mass of stars by determining the
- speed of the orbitals stars
when the binary system pulls on each other than the scientists can determine the size, and from this characteristic mass of the star is calculated.
