- Select three of these learning objectives to be discussed. write a post which discusses the three learning objectives you have selected. (MAKE SURE TO LIST THE OBJECTIVE BEING USED)
There is a word length requirement for your initial post. If you wish to receive full credit for your initial post, it must be at least 200 words long as measured by a word processor, such as, MS Word.
Chapter 26: Galaxies
- Describe the discoveries that confirmed the existence of galaxies that lie far beyond the Milky Way Galaxy.
- Explain why galaxies used to be called nebulae and why we don’t include them in that category anymore.
- Describe the properties and features of elliptical, spiral, and irregular galaxies.
- Explain what may cause a galaxy’s appearance to change over time.
- Describe the methods through which astronomers can estimate the mass of a galaxy.
- Characterize each type of galaxy by its mass-to-light ratio.
- Describe the use of variable stars to estimate distances to galaxies.
- Explain how standard bulbs and the Tully-Fisher relation can be used to estimate distances to galaxies.
- Describe the discovery that galaxies getting farther apart as the universe evolves.
- Explain how to use Hubble’s law to determine distances to remote galaxies.
- Describe models for the nature of an expanding universe.
- Explain the variation in Hubble’s constant.