Relatively small Concentration of 106 to 1012 stars, dust and gas, that are gravitationally bound. Our galaxy contains ~2 × 1011 stars. There are four main types of galaxies: • Elliptical • Lenticular • Spiral • Irregular Click on Term to Read More, typically containing ~107 stars. There is no official size below which a galaxy is designated a dwarf but any galaxy with a diameter below 30,000 light years can be considered a dwarf. The Large and Small Magellanic Clouds, visible in the Southern Hemisphere at a distance of ~50 kpc, are two irregular dwarf galaxies gravitationally bound to the Milky Way. The latter contains ~1011 stars.
Some or all content above used with permission from J. H. Wittke.