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Author Question: A ____________ will be obtained from an observed star's spectrum that has been shifted towards ... (Read 78 times)

sam.t96

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on: Jul 27, 2018
A ____________ will be obtained from an observed star's spectrum that has been shifted towards shorter wavelengths as the star is moving ________ us.
 
  Fill in the blank(s) with correct word

Question 2

Why don't eclipses occur at every new Moon and full Moon?
 
  What will be an ideal response?


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Harbringer

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

blueshift, toward

Answer to Question 2

The Moon's orbit is tipped a few degrees to the plane of Earth's orbit, so at most new or full Moons, the shadows miss, and there are no eclipses. For an eclipse to occur, the Moon must be passing through the plane of Earth's orbit.


sam.t96

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Reply 2 on: Jul 27, 2018
Excellent

blakcmamba

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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