Ultimately, everything arrived on Earth from space.
As dying stars explode, they leave behind heavier elements (Stars are basically huge fusion reactors, which produce heavier elements from H and He.), which starts orbiting other stars, and eventually forms planets.
Meteors are mostly made up entirely of ice water, water is made from the most common element (H) and the 3rd most common element (O), water is very common throughout space.
As with anything on Earth, or the moon, or any other planet that has water, the possibility of that water arriving there in the same way iron does, or helium does, or zinc does, or carbon does,, through the gravitational pull of these atoms (Created from other, dead stars.) is a lot higher than any other possibility.
Of course, water molecules not being very heavy means that once water enters the atmosphere of a planet, that water very, very rarely leaves the atmosphere of that planet. It simply accelerates too fast towards the mass of the planet to escape.
But to say that all of the water would've arrived on Earth in the same way is absurd. There are lots of possible ways water could've easily arrived on Earth (Without the need for supernatural entities.), such as meteors, it being there when the planet formed, etc, that it's much more likely that it's a combination of them all.
As dying stars explode, they leave behind heavier elements (Stars are basically huge fusion reactors, which produce heavier elements from H and He.), which starts orbiting other stars, and eventually forms planets.
Meteors are mostly made up entirely of ice water, water is made from the most common element (H) and the 3rd most common element (O), water is very common throughout space.
As with anything on Earth, or the moon, or any other planet that has water, the possibility of that water arriving there in the same way iron does, or helium does, or zinc does, or carbon does,, through the gravitational pull of these atoms (Created from other, dead stars.) is a lot higher than any other possibility.
Of course, water molecules not being very heavy means that once water enters the atmosphere of a planet, that water very, very rarely leaves the atmosphere of that planet. It simply accelerates too fast towards the mass of the planet to escape.
But to say that all of the water would've arrived on Earth in the same way is absurd. There are lots of possible ways water could've easily arrived on Earth (Without the need for supernatural entities.), such as meteors, it being there when the planet formed, etc, that it's much more likely that it's a combination of them all.
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