18. Galaxy Summary Table Values Spiral Elliptical Irregular Mass (Milky Way = 1) 0.005 to 2.0 0.000001 to 50.0 0.0005 to 0.15 Diameter (Milky Way = 1) 0.2 to 1.5 0.01 to 5.0 0.05 to 0.25 Luminosity (Milky Way = 1) 0.005 to 10.0 0.00005 to 5.0 0.00005 to 0.1 Star Population Old and Young Old Old and Young Interstellar Matter (gas and dust) Moderate Little Plentiful
24. Magellanic Clouds LMC, red glows are nebulae in the LMC Clouds from Lake Titicaca, Bolivia http://www.ctio.noao.edu/~mcels/gallery/lmc.1.jpg
25. Magellanic Clouds & Milky Way http://www.atnf.csiro.au/news/press/images/magellanic_pics/MSsim_labels.jpg
26. Milky Way & Clouds in infrared from 2MASS http://astsun.astro.virginia.edu/~mfs4n/sgr/2mass_allskyatlas.jpg http://astsun.astro.virginia.edu/~mfs4n/sgr/sgr.flyaround.mpg
36. Large-Scale Structure of the Universe http://www.astro.princeton.edu/~cen/PROJECTS/p1/DARKallz0.jpeg Sheets & Voids: http://heasarc.nasa.gov/docs/cosmic/sheets_voids.html
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40. 3C 273-Quasar HST image of 3C 273 showing disk details (quasar blocked) 3C 273 Starfield in Virgo 3C 273 is one of the first identified quasars, it resembles an 11 th magnitude star in Virgo and is visible in small amateur telescopes
![Galaxy Classification ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)