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Name: mortis
Status: N/A
Age: N/A
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Date: 1993 - 1999

When water goes down the drain, it rotates due to the Coriolis effect. What accounts for the rotation of galaxies? Why do galaxies spread out in a disk - is there some kind of gravity surface on which dust collects? Same for disks of dust around stars - why disks? Why are all the solar planets co-planar (or nearly so)? Why not random

Well, I'll take on the first one. Get a physics book and see if you can estimate the size that a wash basin would have to be to be affected by the Coriolis effect when it is draining. What does your favorite encyclopedia say about galactic rotation and the plane in which the planets move?

J Lu

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