1. What does the professor main discuss? 
  • A. ways that stars become nebulae
  • B. reasons that nebulae appear to give off blue light
  • C. difference between nebulae and stars
  • D. a basis for classifying types of nebulae

2. What point does the professor make about orion’s sword? 

  • A. it points toward a nebula in the constellation taurus.
  • B. it contains a nebula that looks like a star to the naked eye.
  • C. it contain stars whose light is a reflection of other nearby stars. 
  • D. it contains two stars that are remnants of a supernova.

3. What does the professor say about the origin of the crab nebula? 

  • A. It was formed when interstellar gas clouds combined.
  • B. It was created by an exploding star.
  • C. It did not emit when it was first formed.
  • D. It was formed in the same way as many reflection nebulae.

4. Based on the lecture, which answer choices describe emission nebulae and which describe reflection nebulae?
[Click on an answer choice, Then drag in to the space where it belongs. One of The answer choices will not be used.]

emission nebulae Drag your answer choices here
reflection nebulae Drag your answer choices here

Answer Choices:

  • A. They can only be seen from locations near the equator. 
  • B. They do not contain glowing gas.
  • C. Young stars may cause their gas to glow.
  • D. They give off red light. 
  • E. They give off blue light.

5. What is a typical characteristic of dark nebulae? 

  • A. They are obscured from view by nearby stars.
  • B. They are located in parts of the sky that do not contain bright stars. 
  • C. The dust and gas they contain are too dense to let light through.
  • D. They are too hot to emit radiation in the visible range.

6. Listen again to part of the lecture. Then answer the question.
Why does the professor say this: 🎧
[So star formation is not necessarily the source of the light in Emission Nebulae.]

  • A. To clarify his previous statement
  • B. To call attention to an unusual phenomenon 
  • C. To emphasize a feature of all types of nebulae 
  • D. To repeat a point he made earlier


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