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

GALACTIC UNIVERSE


Galactic universe

What is a Galaxy?

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


Galactic universe

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


Galactic universe

Spiral Galaxy


Galactic universe

Spiral Galaxy


Galactic universe

Spiral Galaxy


Galactic universe

Spiral Galaxy


Galactic universe

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


Galactic universe

Elliptical Galaxy


Galactic universe

Elliptical Galaxy


Galactic universe

Elliptical Galaxy


Galactic universe

Elliptical Galaxy


Galactic universe

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


Galactic universe

Irregular Galaxy


Galactic universe

Irregular Galaxy


Galactic universe

Irregular Galaxy


Galactic universe

Nebulae

Stellar Nebula (where stars are born)

Planetary Nebula

(death of a star)

Movie


Galactic universe

Stellar Nebula


Galactic universe

Stellar Nebula


Galactic universe

Stellar Nebula


Galactic universe

Stellar Nebula


Galactic universe

Planetary Nebula


Galactic universe

Planetary Nebula


Galactic universe

Planetary Nebula


Galactic universe

Planetary Nebula


Galactic universe

Colliding Galaxies


Galactic universe

Betelgeuse

Rigel

Orion Constellation


Galactic universe

Supernovae


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