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Author Question: Most comets spend the majority of their time beyond the orbit of ________, yet many of them have ... (Read 94 times)

nramada

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Most comets spend the majority of their time beyond the orbit of ________, yet many of them have perihelions very close to the Sun.
 
  Fill in the blank(s) with correct word

Question 2

What makes us think that the star system Cygnus X-1 contains a black hole?
 
  A) It emits X-rays characteristic of an accretion disk, but the unseen star in the system is too massive to be a neutron star.
  B) No light is emitted from this star system, so it must contain a black hole.
  C) The fact that we see strong X-ray emission tells us that the system must contain a black hole.
  D) Cygnus X-1 is a powerful X-ray burster, so it must contain a black hole.



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meganmoser117

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Answer to Question 1

Pluto

Answer to Question 2

A



nramada

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Both answers were spot on, thank you once again




 

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