Explorations: Introduction to Astronomy (Arny), 6th EditionChapter 16:
The Milky Way Galaxy <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0010202009/220722/chapter16_1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (66.0K)</a>]]>
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- Galaxies have a variety of shapes, but three types dominate:
- Spiral
- Elliptical
- Irregular
- Many galaxies have a massive black hole at their center.
- All but the nearest galaxies are receding from us and show a redshift in their light.
- The farther a galaxy is from us, the faster it recedes (Hubble law).
- Galaxies occur in groups called galaxy clusters.
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