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Astronomy: Binoculars, for fun and profit (Posted on 2018-06-29) Difficulty: 4 of 5

True story: In a tough astronomy Oral Exam, my grinning professors posed this problem:
"How would you determine the density of Jupiter using only a pair of binoculars? Assume you don't know the planet's distance."
"Umm..." But, to my surprise, I figured it out.

Once outside the exam room, I boasted of my accomplishment to my friend Rico. "Impossible!" he proclaimed. I bet him 10$ and won. How did I do it?

See The Solution Submitted by Steven Lord    
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Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Hint | Comment 4 of 5 |
(In reply to re: Hint by Charlie)

I think if corrected the volume formula and carried it forward in the calculation and modified the post accordingly.
  Posted by Charlie on 2018-07-05 19:58:20

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