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Where did water come from?

Discussion in 'Chemistry' started by JakeNoolan, 7 Oct 2014.

  1. JakeNoolan

    JakeNoolan Well-Known Geek

    We know there's plenty of it - about 71 of the planet's surface is water-covered - but where did all the water come from in the first place?
     
  2. amusicsite

    amusicsite dn ʎɐʍ sᴉɥ┴ Staff Member

    Location:
    UK
    Well the earth can make some from hydrogen and oxygen but I believe the theory goes that most of it came in on asteroids while the earth was cooling
     
  3. That always struck me as being a really weird concept! I'm sure that some really clever people have juggled the numbers, but there must have been an awful lot of big asteroids to carry enough water in to fill all of the oceans.
     
  4. amusicsite

    amusicsite dn ʎɐʍ sᴉɥ┴ Staff Member

    Location:
    UK
    Well, we don't really know how much water is still floating around out there? Could still be enough to fill the oceans 10 times over for all we know.
     
  5. welsh dragon

    welsh dragon Active Geek

    The simple answer is we don't know where our water came from. One things for sure, it is impossible to make water on earth because of the processes that are needed, so logically water came from somewhere else.

    The molecules that create water came Into being during the big bang. Asteroids were created and water molecules attached themelves to the asteroids. In turn millions of asteroids were created and large numbers of these slammed into the earth at various times, depositing the water onto our planet.

    If not asteroids, then how do you think water got here? It must have been something like asteroids that carried water here.
     
  6. amusicsite

    amusicsite dn ʎɐʍ sᴉɥ┴ Staff Member

    Location:
    UK
    It's not impossible to create water on earth, there are many ways this can happen...

    http://en.m.wikipedia.org/wiki/Origin_of_water_on_Earth#Origins

    What we don't know is what percentage came from which source. Asteroids could have supplied 80% or as little as 20%. We just don't know.
     
  7. welsh dragon

    welsh dragon Active Geek

    Exactly. We have no idea where it came from and I have no doubt that another and more theories will be created and discounted with regularity. Some wil, make sense, and some willbe preposterous.