ATTENTION: The Boards will be closed permanently on May 28th, 2014. Posting will be disabled on April 28th, 2014. More Info

Asterooid crashes most likely gave Earth Water


GROUP: Members

POSTS: 2297

Report this Jul. 13 2012, 9:56 pm

I found this interesting article on yahoo about how earth got water.

Asteroid Crashes Likely Gave Earth Its Water Asteroids from the inner solar system are the most likely source of the majority of Earth's water, a new study suggests.

The results contradict prevailing theories, which hold that most of our planet's water originated in the outer solar system and was delivered by comets or asteroids that coalesced beyond Jupiter's orbit, then migrated inward.

"Our results provide important new constraints for the origin of volatiles in the inner solar system, including the Earth," lead authorConel Alexander, of the Carnegie Institution of Washington, said in a statement. "And they have important implications for the current models of the formation and orbital evolution of the planets and smaller objects in our solar system."


Alexander and his colleagues analyzed samples from 86 carbonaceous chondrites. These primitive meteorites are thought to be key sources of the early Earth's volatile elements, such as hydrogen and nitrogen.

The team measured the abundance of different hydrogen, nitrogen and carbon isotopes in the chondrite samples. Isotopes are versions of an element that have different numbers of neutrons in their atomic nuclei. For example, the isotope deuterium — also known as "heavy hydrogen" — contains one neutron, while "normal" hydrogen has none.

The amount of deuterium in celestial bodies' water ice sheds light on where the objects formed in the solar system's early days. In general, bodies that took shape farther from the sun have relatively higher concentrations of deuterium, researchers said.

The 86 chondrite samples' deuterium content — which the team gleaned from clays, the remnants of water ice — suggest the meteorites' parent bodies formed relatively close to the sun, perhaps in the main asteroid belt between Mars and Jupiter.

Comets, by contrast, have much higher deuterium ratios. As a result, scientists think most of them were born in the solar system's frigid outer reaches.

The isotopic composition of the bulk Earth appears to be more consistent with chondrites than with comets, researchers said. There are many different types of chondrites, and no single group is a perfect match. So our planet probably accreted its water and other volatiles from a variety of chondrite parent asteroids, they added.

The study appears today (July 12) online in the journal Science.


GROUP: Members

POSTS: 2152

Report this Jul. 16 2012, 8:24 am

Couldn't deuterium just be explained by radioactive processes in the early Earth's oceans, both internally and through cosmic bombardment?

Var Miklama--Zakdorn, engineer. "A sound mind in a FULL body!" "Time, like latinum, is a limited quantity in the galaxy."

randy kerr

GROUP: Members

POSTS: 425

Report this Jul. 17 2012, 10:43 am

i think so?


GROUP: Members


Report this Jul. 17 2012, 12:48 pm

I swear this theory has been around for ages, our oceons/water came from astorids and comets. 


GROUP: Members

POSTS: 2152

Report this Jul. 19 2012, 6:22 am

Quote: /view_profile/ @


>Totally wrong. A wizard God did it.


I agree.  I think Genesis 1 refers to "Snowball Earth," during the Precambrian period, when the entire planet was frozen in ice.  Some people think the Moon was knocked from the Earth's material (the Pacific Ocean floor?).  Interestingly, some myths talk about people who lived on Earth when there was no Moon. Before that, who can be sure?

Var Miklama--Zakdorn, engineer. "A sound mind in a FULL body!" "Time, like latinum, is a limited quantity in the galaxy."

Forum Permissions

You cannot post new topics in this forum

You cannot reply to topics in this forum

You cannot delete posts in this forum