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Home Q & A Board Science-Related Homework Help Physics Astronomy
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kkoonge kkoonge
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6 years ago
A _____ is a collapsing cloud of gas and dust destined to become a star.
 
  A) protostar
  B) protocloud
  C) stellar cluster
  D) stellar association

Question 2

Which of the following statements is true of protostars?
 
  A) They are luminous red objects.
  B) They are smaller than main-sequence stars.
  C) They have completely collapsed.
  D) They have temperatures that are more than 10,000 K.

Question 3

The warmer brown dwarfs fall in spectral class _____.
 
  A) O
  B) A
  C) L
  D) T

Question 4

About 75 percent of the mass of interstellar gas is _____.
 
  A) nitrogen
  B) helium
  C) hydrogen
  D) argon

Question 5

Identify a true statement about brown dwarfs.
 
  A) They are low-luminosity objects.
  B) They are almost the same size as Mars.
  C) They generate energy by hydrogen fusion.
  D) They emit most of their energy in positrons.

Question 6

T Tauri stars are post-main-sequence stars.
 
  Indicate whether the statement is true or false
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Michael876Michael876
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6 years ago
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kkoonge Author
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#2
6 years ago
What an awesome place to get free homework help
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#3
6 years ago
What makes it awesome is that you posted, thanks for trusting us
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