In: Physics
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?