Chapter 15 Homework

Chapter 15 Homework - Chapter 15 Fill in the Blank Fill In...

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Chapter 15 Fill in the Blank Fill In the Blank 5. The Milky Way Galaxy, the Andromeda Galaxy, and about 20 others form a small cluster known as the local group 6. In the Tully—Fisher relation, a galaxy’s luminosity is found to be related to the rotation of its spectral lines. 7. Galaxy clusters are themselves clustered, forming _______. 11. More than 90 percent of the mass in galaxy clusters exists in the form of dark matter . 13. Hubble’s law is a correlation between the redshifts and the distances of galaxies. Review and Discussion 2. Describe the four rungs in the distance-measurement ladder used to determine the distance to a galaxy lying 5 Mpc away. Astronomers use “standard candles” as distance measuring tools. They are easy to see objects whose luminosities lie in a reasonably well defined range. By comparing luminosity and apparent brightness, astronomers determine the distance using the inverse square law. 3. Describe the contents of the Local Group. How much space does it occupy compared
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This homework help was uploaded on 04/02/2008 for the course ASTR 101 taught by Professor Caffo during the Fall '06 term at New Mexico.

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Chapter 15 Homework - Chapter 15 Fill in the Blank Fill In...

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