Synestia
Hypothesized entity in outer space / From Wikipedia, the free encyclopedia
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A synestia is a hypothesized rapidly spinning doughnut-shaped mass of vaporized rock. The term was coined in 2017 by Sarah T. Stewart-Mukhopadhyay, taken from Hestia, goddess of the hearth, combined with syn- meaning together.[1] In computer simulations of giant impacts of rotating objects, a synestia can form if the total angular momentum is greater than the co-rotational limit.[2] Beyond the co-rotational limit, the velocity at the equator of a body would exceed the orbital velocity.[3]
In the case of a synestia, the result is an inner region rotating at a single rate with a loosely connected torus orbiting beyond it.[4] Synestias also have differences in the mantles, both thermally and in their composition, from previous terrestrial evolution models due partially to a lower interior pressure.[5]