Ch25 - Assignment: Chapter 25 Class: Astronomy I Date:...

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Assignment: Chapter 25 Class: Astronomy I Date: November 21 st , 2007 Review Questions 1. These quasars were originally called quasi-stellar objects in order to distinguish them from radio emitters because they emit little or no radio radiation. 2. Astronomers took photographs of unknown emission lines from a source. 3. Quasars are billions of light years away from Earth. It would be hard to find a standard candle luminous enough to use in observation. 4. First you would try to measure the redshift of the object. Quasars have immense redshifts, so it would be apparent. 5. The light of the quasar we see today are actually from 25.9 billion years ago. 6. The spectral lines of quasars are shifted versions of ordinary spectral lines. 7. Neutron stars are very small, they should rotate rapidly. And their small sizes also imply that they have intense magnetic fields. 8. The magnetic field of a neutron star makes it possible for the star to radiate pulses of energy toward our telescopes. 9.
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This note was uploaded on 08/25/2008 for the course ASTRON 1 taught by Professor Jsepikas during the Winter '07 term at Pasadena City College.

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Ch25 - Assignment: Chapter 25 Class: Astronomy I Date:...

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