You find a star orbiting about the center of the galaxy at a distance of 15 kpc.Using the rotation curve in the figure shown below, estimate how much mass is enclosed within the orbit of that star.You can assume the star is on a circular orbit around the center of the Milky Way. 
Definitions:
Civilian Population
Non-military individuals and communities who are generally considered to be outside of the combatant categories during times of war or conflict.
General Sherman
refers to William Tecumseh Sherman, a Union general during the American Civil War, known for his "March to the Sea" campaign, which aimed to demoralize the South.
Atlanta
A major city in Georgia, known for its significant role in both the Civil War and the civil rights movement.
Mississippi River
One of the largest rivers in the United States, flowing south from Minnesota to the Gulf of Mexico, and playing a significant role in the country’s commerce and ecology.
Q28: Imagine that you lived in a universe
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Q35: Astronomers know they've found evidence of a
Q41: If you find a halo star that
Q45: These three barred spirals are the largest
Q54: If the Sun were colder and dimmer
Q55: Most of the stars near the Sun
Q58: If a Seyfert galaxy's nucleus varies in
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Q98: The first step in the CNO cycle