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symbo symbo
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7 years ago
A star appears to move back and forth with a period of exactly 1 year with respect to a distant galaxy which appears close to it in our sky. What is the most likely cause of this observed motion?

(a)   The star is relatively near to the solar system and the Earth's orbital motion produces an apparent change in its position against the background (i.e., the galaxy) because of motion of the observer.
(b)   The star has an unseen companion star and the observed motion is due to the star's orbital motion around its companion star with a period of exactly 1 year.
(c)   The observed motion is simply the motion of the star around the center of the galaxy.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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papachulopapachulo
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symbo Author
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7 years ago
This calls for a celebration Person Raising Both Hands in Celebration
jayfo05
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Yesterday
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ofsuahasiufhoas
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2 hours ago
Good timing, thanks!
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