How do we know the total mass of the Milky Way Galaxy that is contained within the Sun's orbital path?
A. by counting the number of stars visible in this region of the galaxy
B. by estimating the amount of gas and dust in between the stars
C. by using the law of conservation of angular momentum to calculate the orbital speeds of nearby stars
D. by applying Newton's version of Kepler's third law to the orbits of the Sun or other nearby stars around the center of the Galaxy
Answer:A
How do we know the total mass of the Milky Way Galaxy that is contained within the Sun's orbital path?
A. by counting the number of stars visible in this region of the galaxy B. by estimating the amount of gas and dust in between the stars C. by using the law of conservation of angular momentum to calculate the orbital speeds of nearby stars D. by applying Newton's version of Kepler's third law to the orbits of the Sun or other nearby stars around the center of the Galaxy