Mass is density multiplied by volume,
(You get to pick density, which means how heavy something is per unit as compared with an equal volume of water) Example: how does a bucket of coolwhip compare with a bucket of water? Things that float, like wood, have a density of less than one: rocks have a density of more than one. Did you read the page on mass, density, and volume?
Anyway, the mass is the density of the unit (say the bucket of coolwhip) multiplied by how many buckets you have. The mass of a planet is enormous.
I have simplified it somewhat by making the radius of the planet earth equal to one earth radius: then we can compare the mass of other planets to it using small numbers that make some sense to us.
If you go to the page called Circle Math you will see that the volume of the earth is 4.18 using the radius of 1
Calculating the mass of the earth, we multiply the volume, 4.18 by 5.5 which is the density of the earth. 4.18 * 5.5 equals 22.99 which I would round up to 23.
Figure out the volume of your planets, then multiply by the density. Your mass will not come out in kilograms because we used a different unit for the radius.
The number is enough.
Try using the Circle Math and Finding the Mass of Your Planet Pages.
Let me know if they still donít make sense to you.
Iíve been doing some reading on this, and the scientists think that there would be no ice caps on the poles if the poles are all covered by water. The land can give the ice a base and glaciers form on top of it, but your cold poles would perhaps make ice that would just drift away into warmer waters.