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Bubbly Universe

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#16700
Fun:*** (2.37)
Difficulty:*** (2.48)
Category:Science
Submitted By:JakeAadminus*mod!!!

 

 

 



In a universe with the same physical laws, but which is mostly water with little bubbles in it, do the bubbles attract, repel, or what?


Answer

A bubble should produce a gravitational field that is the negative of that produced by an equal volume of water in an empty universe. This is because a point in space would be affected only by the water in the symmetric image of the bubble with respect to that point. The effect on another bubble in that field would be to attract that bubble since it would be pushing the water around it away. Therefore, the bubbles should attract.
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