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Comet Hartley 2 observed by ESA’s Herschel
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EU–(ENEWSPF)–5 October 2011,
ESA’s Herschel infrared space observatory has found water in a comet with almost exactly the same composition as Earth’s oceans. The discovery revives the idea that our planet’s seas could once have been giant icebergs floating through space.
The origin of Earth’s water is hotly debated. Our planet formed at such high temperatures that any original water must have evaporated. Yet today, two-thirds of…
