Originally Posted By: paul
they must be extremely heavy to just remain orbiting the sun at such a close proximity otherwise they would need a tremendous velocity to remain in orbit.

That doesn't follow at all. The speed required to orbit around a body depends primarily on the distance from the center of the body. The mass of the orbiting body has almost nothing to do with the radius of the orbit. This of course is the case when the orbiting body is much less massive than the body being orbited. The actual orbit is determined by the combined mass of the 2 bodies and the speed of the orbiting body. Obviously the sun is much more massive than anything else that might be orbiting it, so the mass of the orbiting body can be ignored in the calculation.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.