Earth has been sending out strong radio messages for about 115 years,so detection equipment on a hypothetical planet 115 light-years away might just now begin receiving them.What is the parallax angle subtended by a system at this distance? Can we detect such a parallax angle with our present technology?
A) 0.0027 arcseconds; no
B) 0.0087 arcseconds; yes
C) 0.028 arcseconds; yes
D) 115 arcseconds; yes
Correct Answer:
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