Howling:Question about Gallifrey

Hey there. I recently got "Universe Sandbox" from Steam. As some may know, it allows you to simulate planets and the universe, with real physics. My question is, does anyone have the following info for Gallifrey?

Mass

Diameter

Density

Total Velocity

Rotation Period

SPOILERS FOR THE END OF TIME

What I want to do, is introduce Gallifrey into the orbit of Earth, so that I can see what would happen had Gallifrey not been returned

I'm afraid I don't think the necessary data are available. About all that seems to be known is that Gallifrey's diameter is several times greater than Earth's. The surface gravity seems to be about the same as Earth's, though, which could (if the diameter were known) be used to calculate an approximate mass and density. --89.242.75.233 12:50, July 28, 2011 (UTC)

Further thoughts: For the surface gravity to stay the same, the mass has to increase in proportion to the square of the radius (or diameter) but the volume increases in proportion to the cube, so the density varies in inverse proportion to the radius. That means Gallifrey must be considerably less dense than Earth, which fits with the idea that it's very, very much older. (In The Runaway Bride, Gallifrey was said to be one of, perhaps the main one of, the planets that defeated the Racnoss and a Racnoss ship fleeing that defeat "became the centre of the Earth" at its initial formation.) If Gallifrey is that much older than Earth, there would have been fewer heavy elements available at the time of Gallifrey's formation -- stars would have had less time to make the heavier elements. --89.242.75.233 13:36, July 28, 2011 (UTC)