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Colliding Galaxies

Colliding Galaxies. Ellipticals generally have old stars (type II). This suggests that they were formed first. The center of spiral galaxies also have type II stars. The disk of a spiral galaxy has type I stars that are young. Star Ages. Close Encounters.

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Colliding Galaxies

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  1. Colliding Galaxies

  2. Ellipticals generally have old stars (type II). This suggests that they were formed first. The center of spiral galaxies also have type II stars. The disk of a spiral galaxy has type I stars that are young. Star Ages

  3. Close Encounters • Galaxies are attracted to each other by gravity. • If two ellipticals pass each other gas and stars are pulled. • The galaxy is distorted as it rotates.

  4. New Star Regions • As an elliptical passes through, the stars do not collide. • The gas and dust in the two galaxies collide. • The increased density and gravity creates new stars.

  5. Ring Galaxies • One galaxy may pass through another. • The collision forms a ring of stars and gas. • Gravity can pull the stars in, forming spiral arms.

  6. Forming Spirals • Computer simulations are used to see the effect of collisions. • A near miss forms a spiral galaxy (top sequence). • A direct hit forms a ring galaxy (bottom sequence).

  7. History in Shapes • Spiral galaxies are created by collisions of galaxies. • Many spiral galaxies • Collisions common • Irregular galaxies occur during collisions. • Lasts about 100 million years • The resulting spiral will last for billions of years.

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