Spiral Elliptical Irregular
Mass 109-1012 106-1013 108-1011
Luminosity 108-1011 106-1011 108-1011
Diameter 10-100 2-400 2-6
Stars PopII-halo,bulge PopI-disk Pop II Pop I & II mixed
Gas & Dust In the disk Very little In abundance
Location Preferentially in low galaxy density regions Large ellipticals- primarily in rich clusters Dwarfs-omnipresent Preferentially in low galaxy density regions
The masses and luminosities in this table are in units of the mass and luminosity of the sun. One solar mass is 2 x 1030 kg and one solar luminosity is 3.9 x 1026 watts. The diameter is in thousands of light-years.

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These pages designed by Erin McNally (CU'00)... Last modified 18Apr00