Title: 30.1 Galaxies and The Universe

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Presentation transcript:

Title: 30.1 Galaxies and The Universe Stellar Populations in the Milky Way

Word of the Day Nebula: A rotating cloud of interstellar dust and gas.

Stellar Populations in the Milky Way Page 866 Milky Way can be divided into 2 components: Round Part: The bulge and halo. Contains old stars. Traces of heavy elements (elements heavier than helium.) Disk: Spiral arms. Where most star formation takes place. Contains younger stars.

Stellar Populations in the Milky Way Page 866 Stars in regions of Milky Way can be divided into 2 classes: Population I Stars: In spiral arms of disk (Sun is a population I star.) Young stars. Small amounts of heavy elements.

Stellar Populations in the Milky Way Page 867 Population II Stars: In bulge and halo. Old stars Hardly any heavy elements. Oldest known objects in the galaxy are globular clusters: 12 - 14 Billion years old.

Formation and Evolution of the Milky Way Page 867 Halo and bulge contain older stars. Formed First How? Nebula: A rotating cloud of interstellar dust and gas collapsed under its own gravity. Rotation caused cloud to flatten out into a disk shape. Younger stars then formed in spiral arms.

The Orion Nebula