BL Lac objects emit strong emission lines like a normal galaxy c. BL Lac objects vary in brightness just like a normal galaxy *d. the spectrum of the surrounding region resembles that of a normal galaxy. 18. The great distances of quasarsanbsp;...
Title | : | Instructor's manual to accompany Essentials of the dynamic universe |
Author | : | Stephen J. Shawl, Theodore Peck Snow |
Publisher | : | - 1990 |
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