Earth may have started as solar doughnut: If someone mentioned the words solar doughnut, would you think they were talking about: A) A hip doughnut franchise; B) Newly developed snacks for the International Space Station crew; or C) A description of planets in the formative stage?
If you chose C, congratulations. In research published this week, scientists propose using the word synestia to describe spinning, doughnut-shaped masses of rock that are “formed as planet-sized objects smash into each other,” according to a news release from University of California at Davis.
The word synestia is the combination of the prefix syn- meaning together, and Hestia, the Greek goddess of architecture and structures. Earth may have once been a synestia.
Consider that rocky planets formed as smaller objects collided, the news release explains. After these collisions, the bodies melted and partially vaporized before cooling and solidifying to spherical planets. The new research focuses on collisions between spinning objects.
The scientists, Sarah Stewart, professor of planetary sciences and geophysics at the University of California, Davis, and Simon Lock, a graduate student at Harvard University, modeled what happens when Earth-sized rocky planets collide with other large objects with high energy and momentum.
They found that a much larger body could be formed that resembles a doughnut with the center filled in. The duration of Earth’s time as a synestia may have been short, maybe 100 years, the news release explains. After that, it would have lost heat and condensed into a solid object. Some synestias formed from larger objects could have lasted longer.
The research could also explain the formation of the moon. “Most current theories about how the moon formed involve a giant impact that threw material into orbit,” the news release explains. “But such an impact could have instead formed a synestia from which the Earth and moon both condensed.”
The paper, "The structure of terrestrial bodies: Impact heating, co-rotation limits, and synestias," is published in the Journal of Geophysical Research and written by Stewart and Lock.
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