Earth has been sending out radio messages for about 120 years, so detection equipment on a hypothetical planet 120 light-years away might just now begin receiving them. What is the parallax angle subtended by a system at this distance? Can astronomers detect such a parallax angle with existing technology?
A) 0.0026 arcseconds; no
B) 0.0084 arcseconds; yes
C) 0.027 arcseconds; yes
D) 120 arcseconds; yes
Correct Answer:
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