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Earth may have had a elephantine anchor ring of space rocks environ it , similar to those around Saturn , which could have led to chaotic meteorite strikes on our planet ’s surface , new inquiry suggests .
The hypothesized doughnut may have shape rough 466 million long time ago and was the remains of a mammoth asteroid tugged asunder by Earth ’s tidal force after overstep our planet’sRoche limit .
An artist’s impression of Earth and its ancient asteroid ring.
Casting a vestige across Earth ’s equator , the ringing may have contributed to a global cooling event by blocking sunshine , while bombarding the surface with meteorites . The investigator publish their finding Sept. 16 in the journalEarth and Planetary Science Letters .
" Over millions of long time , material from this ring gradually fell to Earth , creating the capitulum in meteorite impacts mention in the geological platter , " study lead authorAndy Tomkins , a professor of erratic skill at Monash University in Australia , said in a statement . " We also see that layers in aqueous rocks from this period contain extraordinary amounts of meteorite debris . "
The scientists arrived at the startling hypothesis by studying a time period in Earth ’s history recognize as the Ordovician ( 485 million to 443 million years ago ) . The Ordovician was a disruptive clock time for our major planet — it was one of the cold-blooded periods in the last 500 million years and saw a striking uptick in the charge per unit of meteorites striking Earth .
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To investigate what could have make these effect , the scientists map the positions of 21 Ordovician asteroid wallop craters , which let out that all the impacts occurred within 30 degree of Earth ’s equator .
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As 70 % of Earth ’s continental crust was located outside this part , the researchers reckon that the probability of this take place by chance was the same as tossing a three - sided die 21 time and getting the same effect 21 time .
With these highly improbable betting odds in mind , the researchers settled on a hypothesis that could explicate both the equatorial strikes and satellite ’s cooling — a closed chain , the remainder of a bang up - up asteroid , encircle Earth at the equator .
More grounds is needed to support the theory , but the ancient ring possibility could explain many aspects of Earth ’s story , especially if rings seem more than once above our satellite before being easy wipe out as their asteroid were sucked down by its gravity , the researchers say .
" The approximation that a ring arrangement could have influenced worldwide temperatures adds a new stratum of complexness to our understanding of how extra - terrestrial event may have shape Earth ’s clime , " Tomkins said .
