|Spring 2010||Astronomy 110||MWF 9:30 &mdash 10:20|
The universe is populated with galaxies — some like our own Milky Way, others very different. Recognizing other galaxies and estimating their distances led astronomers to the realization that the universe is expanding. Looking back, we see galaxies less than a billion years old; galaxy collisions may produce similar objects at the present day. Collisions may also spark galactic activity by feeding central black holes.
Please read all of Chapter 15.
|15.1||Islands of Stars|
|15.2||Distances of Galaxies|
|15.4||Quasars and Other Active Galactic Nuclei|
Joshua E. Barnes
(barnes at ifa.hawaii.edu)
17 April 2010