[pasmembers] Re: Where all that water comes from: Followup

  • From: Terri <starstuff@xxxxxxxxx>
  • To: PAS Members ListServ <pasmembers@xxxxxxxxxxxxx>
  • Date: Sat, 27 Sep 2014 18:28:46 -0700

Awesome info, thanks for sharing Alex!

On Sat, Sep 27, 2014 at 6:17 PM, PAUL <dmarc-noreply@xxxxxxxxxxxxx> wrote:

> Thanks.  Very interesting. I heard a summary of the research on Science
> Friday radio program.
> Paul
>   On Saturday, September 27, 2014 8:02 AM, Alex Vrenios <axv@xxxxxxx>
> wrote:
> New insights into the source of water in a solar system: a followup to an
> earlier discussion. The study was published in this week’s issue of the
> journal Science. Here is a summary article from MSN News:
> "Scientists have long debated whether the solar system’s water came from
> ice ionized during the formation of the solar system, or if it predated the
> solar system and originated in the cold interstellar cloud of gas
> from which the sun itself was formed.
> “'It's remarkable that these ices survived the entire process of stellar
> birth,' lead researcher Lauren Cleeves, told Reuters.
> "Cleeves, a doctoral student at the University of Michigan, had been
> studying how radioactivity, galactic cosmic rays and other high-energy
> phenomena impact planet-forming disks of matter that circle young stars.
> "The 'aha' moment, she said, was realizing that conditions in the early
> solar system weren’t right for synthesizing new water molecules.
> “'Without any new water creation, the only place these ices could have
> come from was the chemically rich interstellar gas out of which the solar
> system formed,' she said.
> "To prove the point, she and colleagues ran computer models comparing
> ratios of hydrogen with its heavier isotope, deuterium, which has been
> enriching the solar system’s water over time.
> "To reach the ratios found in meteorite samples, as well as in Earth's
> ocean water and comets, at least some of the water would have had to be
> formed before the sun’s birth, the scientists concluded.
> "The process likely would be the same for other solar systems as well,
> suggesting conditions hospitable for life could exist beyond Earth."
> So, maybe NOVA had it right after all! (At least for now.)
> Alex

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