Space: Arcturus is the brightest star in the northern hemisphe…

Question

Did you know? Arcturus is the brightest star in the northern hemisphere — a red giant 36.7 light years away. In 1933 its light was used to open the Chicago World's Fair — through a photocell pointed at Arcturus. The idea: the star's light had been travelling for 40 years, since the previous fair.

Accepted Answer

Arcturus is the brightest star in the northern hemisphere — a red giant 36.7 light years away. In 1933 its light was used to open the Chicago World's Fair — through a photocell pointed at Arcturus. The idea: the star's light had been travelling for 40 years, since the previous fair.

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