Explorations: Introduction to Astronomy (Arny), 6th Edition

Chapter 17: Galaxies

Problems

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 1010 parsecs 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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