Fig. 4
D/H ratio in the water of comets (including the revised value for Halley from Brown et al. 2012) compared to values in carbonaceous meteorites (CI), the Earth’s oceans, and Enceladus. Displayed data for planets, interstellar medium (ISM), and the protosolar nebula refer to the value in H2. Adapted from Hartogh et al. (2011).
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