A star in the Milky Way that is about 35 percent of the way out from the center of the galaxy has an orbital distance of 17.5 thousand light years and an orbital velocity of 238 km/s.

9.
A star in the Milky Way that is about 35 percent of the way out from the center of the galaxy has an orbital distance of 17.5 thousand light years and an orbital velocity of 238 km/s. What is the mass of the galaxy inside this star's orbital radius? Enter in solar masses.

10.
You independently measure that the mass of the normal matter inside the radius of the above star is 9.14×10⁹ solar masses. What is the fraction of dark matter in the galaxy inside this star's orbital radius?

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genius_generous answered 1 year ago

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A star in the Milky Way that is about 35 percent of the way out from the center of the galaxy has an orbital distance of 17.5 thousand light years and an orbital velocity of 238 km/s.

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A star in the Milky Way that is about 35 percent of the way out from the center of the galaxy has an orbital distance of 17.5 thousand light years and an orbital velocity of 238 km/s.