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Author Question: A spaceship is headed toward Alpha Centauri at 0.999c. According to us, the distance to Alpha ... (Read 150 times)

nmorano1

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on: Jul 27, 2018
A spaceship is headed toward Alpha Centauri at 0.999c. According to us, the distance to Alpha Centauri is about 4 light-years. How far away is Alpha Centauri according to the travelers in the ship?
 
  A) also about 4 light-years
  B) very slightly more than 4 light-years
  C) very slightly less than 4 light-years
  D) quite a bit less than 4 light-years
  E) quite a bit more than 4 light-years

Question 2

What is a galactic wind?
 
  A) a jet of ionized particles shot out of a starburst galaxy
  B) hot gas erupting into intergalactic space from a large superbubble
  C) the heat (infrared radiation) emitted by dust grains in the large molecular clouds of starburst galaxies
  D) the cooler gas pushed out of a starburst galaxy by the intense radiation pressure
  E) a wind created by the expansion of the universe that can move galaxies around


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aloop

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

D

A spaceship is moving past us at a speed close to the speed of light.

Answer to Question 2

B


nmorano1

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


aloop

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


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