Chapter 10 Formation Of The Solar System1

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Transcript of Chapter 10 Formation Of The Solar System1

  • Chapter 10 Formation of the Solar System Section 1 Galaxies
  • Measuring Distance in Space
    • A Light year is the length it takes to measure how far light travels in one year.
    • Light years were created it determine how far stars are from the Earth
  • Types of Galaxies
    • A galaxy is a large group of stars, dust, and gas.
    • Galaxies are classified according to their shape. Edwin Hubble developed the way to do this.
  • The Three Types Bulge in the center with spiral arms. Most galaxies are spiral. Spiral Other info Type of Galaxy
  • Spiral, cont. The milky way is one New stars form on the spiral arms
  • Elliptical Mostly old stars Look like massive blobs of stars Elliptical
  • Irregular These galaxies are distorted b/c of other galaxies Irregular
  • What is in a Galaxy??
    • Huge clouds of gas and dust called Nebulas . A nebula has several jobs. Some might glow, others absorb light and hide other stars. Some reflect starlight.
  • Nebula contd
    • Spiral Galaxies usually have Nebulas, they are good places to form new stars.
  • Star Clusters
    • Globular clusters :Groups of older stars.
    • They are found in a ball like halo surrounding spherical galaxies.
    • They are also found near giant elliptical galaxies.
  • Star clusters contd
    • Open Clusters : closely grouped stars usually located along the spiral disc of a galaxy.
  • Interstellar Medium
    • The material that is between a galaxys stars is called interstellar medium, (clouds of gas and dust).
    • Irregular and spiral galaxies have more interstellar medium than elliptical ones.
  • And then..
    • Scientists look to other galaxies to learn about what early galaxies looked like.
    • Quasars, very powerful energy sources, may be caused by black holes