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Rev

$\begingroup$ Just to add something here. The reason it is thought that water was brought to Earth rather than always being here is because ice would have condensed considerably farther out than the Earth's orbit in our protoplanetary disk. (past the "snowline" 150 - 170K) ay201b.wordpress.com/the-snow-line-in-protoplanetary-disks . It is thought to have been brought to earth by asteroids rather than comets because of the D/H ratios shown in the chart referenced by James above. $\endgroup$
– Jack R. Woods
Commented Mar 21, 2017 at 3:56

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