Celestial gold

时间:2019-03-06 04:04:01166网络整理admin

By Jeff Hecht THAT ring on your finger may be made of unearthly stuff. According to a German researcher, the gold and platinum in the Earth’s crust fell to Earth in meteorites after the planet’s core formed. Earth is known to have coalesced around 4.5 billion years ago from a cloud of dust and gas that originally had the same composition as stony meteorites known as chondrites. Over a period of about 50 million years,