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The amount of water on Earth greatly exceeds that known on or within any other planet in the solar system. Liquid water, which is essential for life to survive, has unique and amazing properties; it covers 70% of Earth’s surface. Where did all Earth’s water come from?

If the Earth and solar system evolved from a swirling cloud of dust and gas, almost no water would reside near Earth’s present orbit. Any water (liquid or ice) that close to the Sun would vaporize and be blown by solar wind to the outer reaches of the solar system (a), as we see happening with water vapor in the tails of comets.

a. “Earth has substantially more water than scientists would expect to find at a mere 93 million miles from the sun.” Ben Harder, “Water for the Rock: Did Earth’s Oceans Come from the Heavens?” Science News, Vol. 161, 23 March 2002, p. 184.

[From “In the Beginning” by Walt Brown ]

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