Earths water unlikely to be from comets!

[MartinW 0]

Results from Europe's Rosetta mission, which made history by landing on Comet 67P in November, shows the water on the icy mass is unlike that on our planet.

The results are published in the journal Science.

The authors conclude it is more likely that the water came from asteroids, but other scientists say more data is needed before comets can be ruled out.

Since August, the Rosetta probe has been orbiting Comet 67P/Churyumov-Gerasimenko, and on 12 November its lander, Philae, made a historic touchdown on the object's surface.

Although the robot's batteries ran out soon after setting down, it gathered a wealth of scientific data, and the Rosetta "mothership" continues to analyse the wandering "ice mountain".

http://www.bbc.co.uk/news/science-environment-30414519

[jaydor 345]

That's it then, no more water for us now that Comet has closed down.. 

[Christopher Low 63]

My water comes from a tap

[hifly 925]

My water comes from my

 

@Martin, could I put ice from 67P in my G&T?

[mutley 4,498]

So is it a heavy water comet? Uncle Martin? 

[jaydor 345]

At my age I get heavy water..  about 3 am..  :D

[ddavid 149]

Do I detect an excess of levity in your comments, Chaps?

@ Joe - you're close, oh, so close...

Cheers - Dai.

[markhudson6 13]

My guess is that Earth's water came from multiple sources, both comets and asteroids.  But I think the main bulk of it was sourced from the local region of the disk material that formed our planet.  When the Earth cooled, a lot of that water bubbled up from the interior and was outgassed by volcanism.

 

Regards,

M. 

[MartinW 0]

Could be right Mark. It's still not fully understood.

It's also possible that some water may have come from volcanism.