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Name: Avin
Status: Educator
Age: 50s
Location: N/A
Country: N/A
Date: N/A 


Question:
What was the original source of water on the earth?



Replies:
Hi Avin!

The original source of water on earth probably began some 4.5 billion of years ago when the planet was beeing formed. Scientists consider 3 possible sources for water , namely: separated from the rocks that made the bulk of earth; arrived from outer-space, as part of meteorites; arrived from outer-space, as part of comets.

These still are theories, mostly because outer-space water sometimes is not exactly the same kind of "our" water ( for example, the hydrogen is heavy isotope deuterium ) .

Anyway, quite answering your question science@NASA bulletin published today (05/18) (Science.nasa.gov/headlines/y2001/ast18may_1.html) tell us about the breaking of comet LINEAR as it passed near the Sun, releasing water with the same composition as oceans earth water. That is somehow a heavy argument for the theory of comets beeing carriers of water to planet earth.

Thanks for asking NEWTON! Tell your friends about it!

Mabel
(Dr. Mabel Rodrigues)



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