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

question 17

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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