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The only way we can measure a planet's mass is through its gravity. This has been the way Earth's mass was measured, too (we can't directly probe what's in Earth's interior, but we can measure the gravity on the surface).
You can calculate the mass of a planet using the formula M=4 π² r³∕G T², where M is the mass of the planet, r and T are the radius of orbit and period of revolution of a satellite around the planet. G is a constant. Knowing these three values you can calculate the mass.
In the case of the earth,you can find out the values r and T of the moon and calcuate the earth's mass.
Originally posted by ignorant_ape
reply to post by Outofcontrol
go ahead - the volume of a sphre = 4/3 pi r3
Originally posted by Shadow Herder
You cant waste water, you borrow it, use it. As long as the ozone does its job along with the atmosphere the water will cycle back down.
Does the estimate include ICE?edit on 9-5-2012 by Shadow Herder because: (no reason given)
that Picture/statistic is complete BS.
A slice through the Earth, and the whole thing; red shows unusually soft, weak rock saturated with water, and blue shows unusually stiff rock.
Originally posted by webpirate
I'm pretty sure this is talking about FRESHwater. Not all water. That little bubble would completely disappear into the Marianas Trench without so much as a wave to James Cameron.
Atlantic ocean, average depth 3339 meters, or 3 kilometers.
Atlantic ocean, areal 106 400 000 square kilometers.
total volume 3.5 * 10^8 cubic kilometers
Radius of such an object ... 437 kilometers. GIven, that this about 20% of the ocean surface (water) on earth, that will give us 5 times this, or about 2000 kilometer radius, of this ball. And given that the Earths radius is 6371 kilometers.
That's a big god damn ball ... that ball on the image is therefore ... bogus