[james4k]

Yes, sort of. I believe the current theory is that much of Earth's water came from thousands or millions of meteorites that carried ice and/or hydrogen and oxygen compounds that later stabilized to water. This would have happened during the solar system's infancy, when there were far more asteroids flying around our solar system. In fact, it is thought that the planets started this way. Lots of free flying rock colliding together, gaining mass, gravity, etc. over billions of years.