Moon and Asteroid Shapes
Name: J-MArc B.
How explain in a simple way that asteroids are potato
shape (even Ceres the biggest one) and the Moon or Titan are spherical
shape. Is it related to a liquid phase in their accretion ?
I think you would be better off talking about the possible histories of
asteroids and moons.
Most objects "should" be spherical since, initially, all space objects start
out as gaseous substances - and at that point must have the dynamics of a
fluid in vacuum, surface tension and gravity being the two forces that would
define the object's shape. But, after that, collisions become the next
powerful shape-defining variable. You might even show pictures of different
moons and show that some of them still show big impact - shape defining
Greg (Roberto Gregorius)
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Update: June 2012