What Is the Only Way to Measure the Mass of a Star

question 7

Multiple Choice

What is the only way to measure the mass of a star accurately?

• A) Measure its gravitational effect on another object.
• B) Measure its spectral type and luminosity class,then use the H-R diagram.
• C) It is not possible to measure the mass of a star.
• D) Measure its distance using trigonometric parallax and its brightness using photometry.