GALACTIC UNIVERSE
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GALACTIC UNIVERSE. What is a Galaxy?. It is a group of billions and billions of stars held together by gravity. Spiral Galaxy. Bulge. Disk. Side View. Top View. Huge; contains stars, gas, and dust Held together by gravity Pinwheel shape/looks like a hurricane Bulge and thin disk

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GALACTIC UNIVERSE

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GALACTIC UNIVERSE


What is a Galaxy?

It is a group of billions and billions of stars held together by gravity.


Spiral Galaxy

Bulge

Disk

Side View

Top View

  • Huge; contains stars, gas, and dust

  • Held together by gravity

  • Pinwheel shape/looks like a hurricane

  • Bulge and thin disk

  • Halo (glow) is present

  • Rich in gas and dust

  • Young and old stars are present


Spiral Galaxy


Spiral Galaxy


Spiral Galaxy


Spiral Galaxy


Elliptical Galaxy

  • Huge; contains stars, gas, and dust

  • Held together by gravity

  • Round to oval

  • Bulge but no disk

  • Halo is present

  • Little cool gas and dust

  • Mainly OLD STARS are present


Elliptical Galaxy


Elliptical Galaxy


Elliptical Galaxy


Elliptical Galaxy


Irregular Galaxy

  • Huge; contains stars, gas, and dust

  • Held together by gravity

  • No regular shape

  • May show signs of a disk and/or bulge

  • Halo is present

  • Usually rich in gas and dust

  • Young and old stars are present


Irregular Galaxy


Irregular Galaxy


Irregular Galaxy


Nebulae

Stellar Nebula (where stars are born)

Planetary Nebula

(death of a star)

Movie


Stellar Nebula


Stellar Nebula


Stellar Nebula


Stellar Nebula


Planetary Nebula


Planetary Nebula


Planetary Nebula


Planetary Nebula


Colliding Galaxies


Betelgeuse

Rigel

Orion Constellation


Supernovae


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