Size

Figure 3 shows to scale the relationship between the sizes of the sun, moon, earth and the 12th planets.

Source Reference:

Stop Rotation

It outweighs the Earth by some 23 times, but by size is not 23 times as large as its weight is due to its makeup, having less silicon than the Earth, for instance. Should one line these planets up side by side, the Earth would look to the 12th Planet as the Moon does to the Earth. Where the gravitational pull on the surface of the 12th Planet is better than half again as much as on the surface of the Earth, ...

Mike