Graphic Organizer: Galaxy types compared

Graphic Organizer:
Comparison of spiral, elliptical, and irregular galaxies
Teacher PDF (126KB) As presented below
Student PDF (440KB) Pictures and blank chart
Spiral galaxies
Elliptical galaxies
Irregular galaxies
Top and side views of spiral galaxies An elliptical galaxy An irregular galaxy
Huge; contain stars, gas, and dust Huge; contain stars, gas, and dust Huge; contain stars, gas, and dust
Held together by gravity Held together by gravity Held together by gravity
Pinwheel shape (see top view of Spiral 1, above) Round-to-oval shape No regular shape
Bulge and thin disk; halo is present (see side view of Spiral 2, above) Bulge but no disk; halo is present May show signs of a disk and/or a bulge; halo is present
Rich in gas and dust Little cool gas and dust Usually rich in gas and dust
Young and old stars are present Mainly old stars are present Young and old stars are present

Graphic Organizer: Galaxy types compared