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On June 20th, 20 13, China astronaut Wang Yaping finished the experiment of making water film and water polo while giving a space lecture in Tiangong-1.
A, under the condition of weightlessness, water droplets are spherical because the gravity of the liquid in weightlessness is all used to provide centripetal acceleration, and the surface tension of the liquid minimizes the surface area of the liquid. Therefore, A is correct;

B, there is both attraction and repulsion between molecules on the liquid surface, and the overall performance is gravity. So, B is wrong;

C, due to the contraction of surface tension, the pressure of gas inside the bubble is greater than that outside the bubble. Therefore, C is correct;

D the surface tension of water will not disappear when the needle tip pierces the water polo. So, d is wrong;

E, water droplets become "rubies" because red liquid molecules diffuse in water; Therefore, e is correct.

So choose: ACE

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