Chapter 10 Formation Of The Solar System1
- 1. Chapter 10 Formation of the Solar System Section 1 Galaxies
- 2. 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
- 3. 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.
- 4. The Three Types Bulge in the center with spiral arms. Most galaxies are spiral. Spiral Other info Type of Galaxy
- 5. Spiral, con’t. The milky way is one New stars form on the spiral arms
- 6. Elliptical Mostly old stars Look like massive blobs of stars Elliptical
- 7. Irregular These galaxies are distorted b/c of other galaxies Irregular
- 8. 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.
- 9. Nebula cont’d Spiral Galaxies usually have Nebula’s, they are good places to form new stars.
- 10. 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.
- 11. Star clusters cont’d Open Clusters : closely grouped stars usually located along the spiral disc of a galaxy.
- 12. Interstellar Medium The material that is between a galaxy’s stars is called interstellar medium, (clouds of gas and dust). Irregular and spiral galaxies have more interstellar medium than elliptical ones.
- 13. 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