D/H ratio vs. mass of selected solar system objects. From left to right, selected comets, chondrites and lunar apatite (Hartogh et al. 2011; Cleeves et al. 2014), Mars, Venus, Earth (Drake 2005), Uranus, Neptune, Saturn, Jupiter (Hartogh et al. 2011), and model brown dwarfs (Spiegel et al. 2011) are shown. The protosolar and Earth D/H vs. ratio are shown as shaded bars. Points with error bars show single measurements; shaded bars show ranges over multiple measurements.