quote:
Originally posted by Lisif Deoral:
A trinary large planet system would cause incredible sunsets... and probably also nightmarish gravity changes. 
Three planets rotating about each other... they couldn't really be very close in mass and very close in location, without throwing each other out of position. I suppose the technology to assemble a planet from asteroids in a month
with "gravitational technology" might allow you to form and maintain a triangle orientation, though. Even that would be quite hard, I think - probably best if you had a fourth, larger, body in the center. Each of the three outer planets would have regular daily tides, though, based on the one center of gravity.
See hits for "the three body problem" such as
http://www.physics.cornell.edu/sethn...er/jupiter.htm
PvK