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Author Question: During the T-Tauri phase of a protostar, it A) begins a period of reduced activity. B) expands ... (Read 20 times)

skymedlock

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on: Jul 27, 2018
During the T-Tauri phase of a protostar, it
 
  A) begins a period of reduced activity.
  B) expands dramatically.
  C) may develop very strong winds.
  D) lies on the main sequence.
  E) changes its spin direction.

Question 2

Why were Type I supernovae so critical in discovering dark energy?
 
  What will be an ideal response?


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ynlevi

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

C

Answer to Question 2

These brilliant explosions are consistent standard candles, visible out to billions of light-years. Instead of finding the most distant galaxies slowing down as expected in a closed universe, the supernovae were even more distant than expected, as dark energy kept the universe forever expanding.


skymedlock

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Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

lcapri7

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Reply 3 on: Yesterday
Gracias!

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