Curtin University researchers use innovative techniques to date three-billion-year-old impact crater in Pilbara region A meteorite that struck Earth three billion years ago left behind a “smoking gun” – evidence of the world’s oldest impact crater in a remote part of Australia. Ancient rocks in Western Australia’s Pilbara region record the event, which occurred during the Archean eon, a period 4 to 2.5 billion years ago, when tectonic plates were beginning to form and early life emerging. Continue reading... from The Guardian https://ift.tt/vFNkr3E via IFTTT
Nearly 50% of 30 busiest airports facing absences as staff are forced to work without pay and shutdown hits 31st day
Nearly 50% of the 30 busiest US airports faced shortages of air traffic controllers, the Federal Aviation Administration (FAA) said on Friday, leading to flight delays nationwide as a federal government shutdown hit its 31st day.
The absence of controllers on Friday is by far the most widespread since the shutdown began, with one of the worst-hit regions being New York, where 80% of air traffic controllers were out, the agency said.
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