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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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eratta | Comment 7 of 10 |
In the answer, in the formula for rho, 3 should be replaced with (3/G)

Edited on July 25, 2020, 12:24 am
  Posted by Steven Lord on 2020-07-24 22:13:43

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