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Earth impacts more frequent..

Posted: Tue Jan 07, 2020 11:56 am
by brian livesey
Scientists at Portsmouth University have used two new dating techniques that appear to show that Wolfe Creek Crater in North-West Australia is 120,000 years old, and not 300,000 years old.
The space body that caused the crater is reckoned to have been an object 15m ( 49 ft. ) in diameter and weighing in at 14,000 tonnes. Wolfe Crater is one of seven sets of craters in Australia that are dated to have occured within the last 20,000 years.
The dating of these craters suggests that the impacts of space bodies with Earth are more frequent than was previously thought.
Dr. Tim Barrows, a professor of environmental change at Portsmouth University, said: "Since Australia has an excellent preservation record with dated craters within the arid zone, we can estimate a [ impact ] date for the whole Earth.
"Taking into account that arid Australia is only about 1% of the surface [ of Earth ], the rate increases to one hitting the Earth every 180 years or so. There have been two big objects hitting the atmosphere in the last century - Tunguska in 1908 and Chelyabinsk in 2013." He added, "Our results give us a better idea of how frequent these events occur." The study is published in the journal "Meteoritic and Planetary Science.
Researchers have discovered the biggest known impact crater on Earth in Laos, under ancient lava flows. It measures 13 km wide and 17km long. It struck Earth 790,000 years ago.

Re: Earth impacts more frequent..

Posted: Tue Jan 07, 2020 1:55 pm
by stella
Something wrong here.
The fourth line indicates that Wolfe creek occurred within the last 20,000 years, but
it is earlier stated that Wolfe creek is 120,000 years old.

Re: Earth impacts more frequent..

Posted: Wed Jan 08, 2020 10:44 am
by brian livesey
It should read 120,000 years Stella. Missed a key!