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Author Question: What two things are needed to create an emission nebulae? A) interstellar gas and dust B) ... (Read 99 times)

jazziefee

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on: Jul 27, 2018
What two things are needed to create an emission nebulae?
 
  A) interstellar gas and dust
  B) hydrogen fusion and helium ionization
  C) cool stars and much interstellar dust
  D) hot stars and interstellar gas, particularly hydrogen
  E) hydrogen gas and carbon dust

Question 2

At which wavelength range is there no current or planned space observatory?
 
  A) radio
  B) infrared
  C) visible
  D) X-ray
  E) gamma-ray


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olivia_paige29

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

A


jazziefee

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Reply #2 on: Jul 27, 2018
TY


olivia_paige29

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Reply #3 on: Jul 27, 2018
You're welcome


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