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Author Question: Explain why observations suggest the presence of dark energy in the universe.? What will be an ... (Read 75 times)

iveyjurea

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on: Jul 27, 2018
Explain why observations suggest the presence of dark energy in the universe.?
 
  What will be an ideal response?

Question 2

If a spaceship travels near the speed of light away from the Earth, an observer on Earth would see the length of the spaceship ________.
 
  Fill in the blank(s) with correct word


heyhey123

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

Observations show that the expansion rate of the universe was slower in the past than its current value. Gravity slows the expansion rate with time so the observed acceleration implies the existence of a new force or energy that h as not been recognized before.

Answer to Question 2

shrink


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