Chapter 10 Formation Of The Solar System1
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stars, galaxies etc.
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