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
President and other top leaders evacuated from the annual dinner after an unspecified threat
“The president will be having a press briefing at the White House in 30 minutes – that is not a joke,” Weijia Jiang, president of the White House Correspondents’ Association, just told the room full of reporters.
“And he insists that we will reschedule this event in 30 days and that he wanted to continue, despite the news, but has to follow security protocol.”
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