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Originally Posted by formulaterp
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Originally Posted by A Thousand Pardons
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Well, I guess one could quibble as to what the "most" common name of the cluster might be. |
No, I just went back and saw
Arneb's
hint was "Hercules"
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Let's say you were observing Jupiter through a telescope. You spot shadows cast on the planet's surface by 3 of the 4 Galilean moons. Even if you cannot identify the moons (or their shadows) individually, you can know the identity of 1 of the moons with complete certainty. Which one is it, and why?
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Three shadows at the same time is unusual, but Io's is substantially bigger than the others and Callisto's would be a lot smaller (I don't think I've ever seen Callisto's shadow)--Europa's and Ganymede's are about the same size.