Most common type, most of these are dwarf galaxies (too small and too dim to be easily seen). Shaped like large, 3-dimensional ellipses (football shaped). Giant elliptical galaxies can be over 9 million light-years across and contain trillions of stars.. Dwarf elliptical galaxies- only about 3,000 light-years across and contain fewer than a million stars. Most contain little gas and dust and cannot make new stars. Irregular galaxies can take many different shapes and contain 100 million to 10 billion stars, Less common than elliptical or spiral. a. Larger than Dwarf ellipticals but smaller than spiral galaxies. a galaxy that does not have a regular shape, typically smaller than other types or galaxies, generally have bright, young stars and lots of gas and dust to form new stars.