English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The D/H enrichment observed in Saturn's satellite Enceladus is remarkablysimilar to the values observed in the nearly-isotropic comets. Given thepredicted strong variation of D/H with heliocentric distance in the solarnebula, this observation links the primordial source region of thenearly-isotropic comets with the formation location of Enceladus. That is,comets from the nearly-isotropic class were most likely fed into their currentreservoir, the Oort cloud, from a source region near the formation location ofEnceladus. Dynamical simulations of the formation of the Oort cloud indicatethat Uranus and Neptune are, primarily, responsible for the delivery ofmaterial into the Oort cloud. In addition, Enceladus formed from material thatcondensed from the solar nebula near the location at which Saturn captured itsgas envelope, most likely at or near Saturn's current location in the solarsystem. The coupling of these lines of evidence appears to require that Uranusand Neptune were, during the epoch of the formation of the Oort cloud, muchcloser to the current location of Saturn than they are currently. Such aconfiguration is consistent with the Nice model of the evolution of the outersolar system. Further measurements of the D/H enrichment in comets,particularly in ecliptic comets, will provide an excellent discriminator amongvarious models of the formation of the outer solar system.

On the formation location of Uranus and Neptune as constrained by dynamical and chemical models of comets