Monday, 23 July, 2018

There Is Evidence That a Planet in Our Solar System Was Destroyed

Could micro-diamonds reveal the secrets of the early solar system Could micro-diamonds reveal the secrets of the early solar system?SEBASTIAN KAULITZKI SCIENCE
Derrick Tucker | 19 April, 2018, 01:51

"Planetary formation simulations suggest that they were tens of planetary embryos in the size range between that of moon and that of Mars in the early solar system". But researchers have discovered that one particular meteorite recovered from the Sudanese desert in 2008 is unique. It was spotted by astronomers a few hours before its collision with the Earth in October 2008, which allowed scientists to observe its fall. Only a planet the size of Mercury or Mars could produce that much pressure, the researchers conclude.

Our stellar neighborhood has eight main planetary bodies, but according to an worldwide team of scientists, there could have been another planet in our backyard, one that might have been destroyed at infancy during the chaotic formation of the solar system or in the ensuing years. Typically, these diamonds form in asteroids when they bang into other rocks in space, creating powerful shockwaves that roll through the orb conver some of its carbon into tiny diamonds, just millionths of a millimeter across. Transmission electron microscopy also revealed traces of chromite, phosphate, and iron-nickel sulfides inside the larger diamonds, which are inclusions that can be found in Earth's diamonds, too.

The black fragment of Almahata Sitta meteorite No.number 15 appears stark against the lighter-colored rocks of the Nubian Desert in northern Sudan.

Although the asteroid's composition didn't remain a mystery for too long - the recovered 50 meteorites were quickly studied and identified as rare ureilites specked with tiny diamonds - little was known about where it had come from.

The research was published online yesterday (April 17) in the journal Nature Communications.

China's trade surplus with USA rises
Trade between the two nations remained strong in the first quarter, with bilateral exchanges rising 13 percent to $142 billion. Looming large over everything is the risk that trade tensions with the U.S. morph into a protracted, widening conflict.

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Police identified the man Monday as Kirushna Kumar Kanagaratnam, who had arrived in Canada in 2010 and lived in the Toronto area. Idsinga said investigators are looking into 15 other cold cases dating back to the 1975, but have not found a connection.

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The Kathua girl, who belonged to the nomadic Bakerwal Muslim community, had disappeared from a spot near her house on January 10. When the girl wrote to PM Narendra Modi and Chief Minister Adityanath, accusing the MLA of rape, action was taken, Lekhi added.

"Although this is the first compelling evidence for such a large body that has since disappeared, their existence in the early Solar System has been predicted by planetary formation models", the researchers wrote in their paper. Students from the University of Khartoum volunteered to search for fragments, ultimately recovering more than 600 pieces of the meteorite now known as Almahata Sitta.

Nanodiamonds can form from "normal" static pressure inside a large parent body like Earth, but there are other origin theories as well.

Such planetary embryos got ejected from the solar system and either became rogue planets or smashed together.

"This study provides convincing evidence that the ureilite parent body was one such large "lost" planet before it was destroyed by collisions some 4.5 billion years ago", the researchers were quoted as saying by EPFL in a news release on Tuesday.

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