Please answer all of the prompts below in 1 to 2 solid paragraphs for each one. 

Discussion Question 15.1

Lesson 15

Objective:
Discuss the nature of active galaxies.

Directions:
Read and respond to the following question and, if appropriate, include a personal experience as part of your answer. Next, read other students’ posts and respond meaningfully to at least two other posts.

Discussion Question:
Explain how astronomers know that quasars existed during a relatively short period in the distant past, using examples.

Study Question 15.1

Lesson 15

Directions:
Read and respond to the following question and, if appropriate, include a personal experience as part of your answer. Next, read other students’ posts and respond meaningfully to at least two other posts.

Discussion Question:
Hubble’s work has become the foundation for theories of cosmology. How?

 Lesson 15 – In Quest of the Universe Chapter 16

Galaxies

Assignment 15.3 – Conflicting Theories about Quasar Redshifts

Assignment Title: Conflicting Theories about Quasar Redshifts
Lesson 15

Directions:
Follow the instructions for the assignment and turn in your response to the instructor as directed.
Cite using MLA any online references or local sources (newspaper, online journal, reference book, etc.) you have used in your research and your response.

Assignment Instructions:
There are two theories about quasar redshift: one uses Hubble’s Law; the other is characterized as the Local Hypothesis.

Using information from the textbook and the internet, research the two theories about quasar redshift.

Explain why, “Almost all astronomers now agree that quasar redshifts do indeed fit the Hubble law.”