2011 Updated at 20:45 ET
Comet's water 'like that of Earth's oceans'
Jason Palmer
Science and technology reporter, BBC News
Comet Hartley 2 was also the subject of the Deep Impact probe study
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Comet Hartley 2 contains water more like that found on Earth than all the comets we know about, researchers say.
link-
http://www.bbc.co.uk/news/science-environment-15181123