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Author Question: If a star is moving ____________ from us, then its spectra will be shifted toward ________ ... (Read 72 times)

big1devin

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on: Jul 27, 2018
If a star is moving ____________ from us, then its spectra will be shifted toward ________ wavelengths, producing a redshift.
 
  Fill in the blank(s) with correct word

Question 2

Why is the eclipse year shorter than 365.25 days?
 
  What will be an ideal response?


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mcabuhat

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

away, longer

Answer to Question 2

The Moon's orbit precesses, because of the gravitational pull of the Sun on the Moon, and the precession slowly changes the direction of the line of nodes. The line turns gradually westward, making one complete rotation in 18.61 years. As a result, the eclipse seasons occur about three weeks earlier each year.


big1devin

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Reply 2 on: Jul 27, 2018
Gracias!

chereeb

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Reply 3 on: Yesterday
Excellent

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