What Two Observations Allow Us to Calculate the Galaxy's Mass

question 35

Multiple Choice

What two observations allow us to calculate the Galaxy's mass?

• A)the Sun's mass and velocity in orbit of the Galactic Center
• B)the Sun's age and period of the Galactic Year
• C)the Sun's orbital velocity and its distance from the Galactic Center
• D)the Sun's mass and its age
• E)the Sun's composition and luminosity

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