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Author Question: Most comets spend the majority of their time beyond the orbit of ________, yet many of them have ... (Read 48 times)

nramada

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

Pluto

Answer to Question 2

A


nramada

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


meganmoser117

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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