The bombardment of a comet, which carried water with it for about 4 billion years ago, was considered the reason behind hydration of Earth until now.

However, a European Space Agency's Rosetta Spacecraft has collected a data, which is creating doubt on this previous theory. Rosetta Spacecraft of ESA, which is chasing a boot-shaped and 1,100-foot wide piece of ice and rock orbiting the sun called as 67P/Churyumov-Gerasimenko. In every six and a half years, the comet is orbiting Sun once.

NASA's project scientist for the US Rosetta Project, Dr. Claudia Alexander together with Pulse host Maiken Scott discussed the findings by the spacecraft.

The data gathered by the spacecraft is leading to the question that water on Earth could be brought by a comet that hydrated Earth, mars and other planets or this planet has the propensity to create its own water.

Alexander said that answers of many of the questions could be revealed in the coming year and her team had also prepared to work with the Dawn space probe's landing at asteroid Ceres and the New Horizons probe's arrival at Pluto in 2015.

"We were looking to measure a certain particle called deuterium. We have some more thinking to do about where did Earth get its water and could Earth have brought out its own water?" said Alexander.

She said it is expected that all three of these missions will lead to the answers that will help to learn more about the origins of solar system.