Scientists Find New Evidence That Water Came To Earth On Asteroid

Posted: May 7 2015, 4:33am CDT | by , in News | Technology News


Scientists Find new Evidence that Water Came to Earth on Asteroid
Photo Credit: Mark A. Garlick,, University of Warwick

New research found new evidence that indeed water came to earth on asteroids. This is likely happening in many other places in the universe. Water is the key to life as we know it on earth.

Why is water on Earth? The answer from scientists is that asteroids or comets have brought the precious liquid to Earth, enabling life. New research found new evidence that this is the case and also says that water delivery via asteroids or comets is likely taking place in many other planetary systems.

The research finds evidence for numerous planetary bodies, including asteroids and comets, containing large amounts of water. The findings add further support to the possibility water can be delivered to Earth-like planets via such bodies to create a suitable environment for the formation of life.

Commenting on the findings lead researcher Dr Roberto Raddi, of the University of Warwick's Astronomy and Astrophysics Group, said: "Our research has found that, rather than being unique, water-rich asteroids similar to those found in our Solar System appear to be frequent. Accordingly, many of planets may have contained a volume of water, comparable to that contained in the Earth.

"It is believed that the Earth was initially dry, but our research strongly supports the view that the oceans we have today were created as a result of impacts by water-rich comets or asteroids".

In observations obtained at the William Herschel Telescope in the Canary Islands, the University of Warwick astronomers detected a large quantity of hydrogen and oxygen in the atmosphere of a white dwarf (known as SDSS J1242+5226). The quantities found provide the evidence that a water-rich exo-asteroid was disrupted and eventually delivered the water it contained onto the star.

The asteroid, the researchers discovered, was comparable in size to Ceres - at 900km across, the largest asteroid in the Solar System. "The amount of water found SDSS J1242+5226 is equivalent to 30-35% of the oceans on Earth", explained Dr Raddi.

The impact of water-rich asteroids or comets onto a planet or white dwarf results in the mixing of hydrogen and oxygen into the atmosphere. Both elements were detected in large amounts in SDSS J1242+5226.

Research co-author Professor Boris Gänsicke, also of University of Warwick, explained: "Oxygen, which is a relatively heavy element, will sink deep down over time, and hence a while after the disruption event is over, it will no longer be visible.

"In contrast, hydrogen is the lightest element; it will always remain floating near the surface of the white dwarf where it can easily be detected. There are many white dwarfs that hold large amounts of hydrogen in their atmospheres, and this new study suggests that this is evidence that water-rich asteroids or comets are common around other stars than the Sun".

The research of the University of Warwick titled "Likely detection of water-rich asteroid debris in a metal-polluted white dwarf" is published in the Monthly Notices of the Royal Astronomical Society by Oxford University Press.

The image above shows an Artist's impression of a rocky and water-rich asteroid being torn apart by the strong gravity of the white dwarf star. Similar objects in the Solar System likely delivered the bulk of water on Earth and represent the building blocks of the terrestrial planets.

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<a href="/latest_stories/all/all/2" rel="author">Luigi Lugmayr</a>
Luigi Lugmayr () is the founding chief Editor of I4U News and brings over 15 years experience in the technology field to the ever evolving and exciting world of gadgets. He started I4U News back in 2000 and evolved it into vibrant technology magazine.
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