[meteorite-list] Science Journal: Earth's water didn't come from comets, scientists now say

[Michael Mulgrew]

I am curious how such a definitive conclusion can be reached from the
analysis of a singular cometary body?  How many comets are out there
floating around the solar system?  I guess they are assuming all
comets have the same make-up?  Seems a bit short sighted to me,
considering, for example, how diverse asteroidal composition is.
Imagine if we landed a probe on one asteroid, then extrapolated the
results of that landing to apply to all asteroids, what a gross
neglect of diversity that would be.

Hopefully I'm missing something here and someone will chime in and
explain it to me.

Michael in so. Cal.

On Fri, Dec 12, 2014 at 12:43 PM, Shawn Alan via Meteorite-list
<meteorite-list at meteoritecentral.com> wrote:
> Hello Listers
>
> Enjoy :)
>
> From The New York Times (excerpted):
>
> One of the first scientific findings to emerge from close-up study of a
> comet has all but settled a question that planetary scientists have
> debated for decades.
>
> The new finding, from the European Space Agency’s mission to the
> little duck-shaped comet called 67P/Churyumov-Gerasimenko, appears to
> eliminate the possibility that the water in Earth's oceans came from
> melted comets.
>
> http://jacksonville.com/opinion/blog/400564/john-leacock/2014-12-11/science-journal-earths-water-didnt-come-comets
>
> Shawn Alan
> IMCA 1633
> ebay store http://www.ebay.com/sch/imca1633ny/m.html
> Website http://meteoritefalls.com
>
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