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Explorations: Stars, Galaxies, and Planets
Thomas Arny, University of Massachusetts
Galaxies

Problem Solving



1

A Cepheid variable in a nearby galaxy looks 106 times fainter than an identical Cepheid in the Milky Way. The Cepheid in the Milky Way is 1010parsecs away. How far away is the nearby galaxy?
2

A galaxy has a recession velocity of 13,000 kilometers per second. What is its distance in megaparsecs?
3

A galaxy has a rotation speed of 200 kilometers per second at a distance from its center of 10 kiloparsecs. What is its mass within this distance?
4

A galaxy has an angular diameter of 0.1 degree. Its distance is 10 megaparsecs. What is its true diameter?








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