Water Coming From Where on Earth?

The origins of our planet's water, which covers up to 70 percent of Earth's surface remains a mystery for scientists. Many argue that water does not occur concurrently with the formation of Earth, but an object from space that drove him to our planet.
It is estimated that, if the water comes together with the formation of planet Earth at 4.5 billion years ago, he most likely has evaporated due to the heat of the sun when it was young. That is, the water probably came from somewhere else.
The planets in (Mercury, Venus, Mars) as well as a new solar system began to be formed, it is still too hot to hold water. Thus, the possibility of water on Earth is not coming from there. However, planets and other celestial bodies like Jupiter's moons, comets, and others quite far from the Sun to allow it to have ice.
During the period of prominence 4 billion years ago, called the Late Heavy bombardment period, a giant object, possibly coming from outside the solar system, showering the Earth and planets in the other. It is possible that these objects filled with water. Earth collision with objects is what makes our planet is filled with water.
So, what objects which deliver water?
For some time, astronomers estimate that the comet, made of ice and rock that has vaporized ice in the tail is long and continuous around the Sun, is thought to be the culprit.
However, measurement of distance to the water that evaporates from a few large comets that exist today such as comet Halley, Hyakutake and Hale-Bopp revealed that the ice that was there made of a different type of H2O because they contain hydrogen isotopes heavier than ice normally found on Earth.
That is, comets are not the source of water for the Earth.
Dicoretnya large comets from the list of suspect water sources, astronomers back looking for clues whether the water on earth come from the asteroid belt.
The area is comprised of hundreds of thousands of asteroids that orbit the Sun between the planets and outer planets previously believed to be too close to the Sun to save water. But the latest evidence, it is known that there is ice in the asteroid 24 Themis was there.
These findings, and ice in other asteroids indicate that there may be more ice in the asteroid belt than previous estimates. This is likely to be a source of water coming on Earth.
Currently, as quoted from Life's Little Mysteries, July 14, 2011, satellite monitors such as NASA's Dawn was sent to explore an asteroid. The hope, in the next few years, we will know more about the mysterious water ice that could potentially help us understand how the origin of water on Earth.


source  http://teknologi.vivanews.com/

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