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A giant meteorite boiled the oceans 3.2 billion years ago. Scientists say it was a ‘fertilizer bomb’ for life
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A massive space rock, estimated to be the size of four Mount Everests, slammed into Earth more than 3 billion years ago — and the impact could have been unexpectedly beneficial for the earliest forms of life on our planet, according to new research.
Typically, when a large space rock crashes into Earth, the impacts are associated with catastrophic devastation, as in the case of the demise of the dinosaurs 66 million years ago, when a roughly 6.2-mile-wide (10-kilometer) asteroid crashed off the coast of the Yucatan Peninsula in what’s now Mexico.
But Earth was young and a very different place when the S2 meteorite, estimated to have 50 to 200 times more mass than the dinosaur extinction-triggering Chicxulub asteroid, collided with the planet 3.26 billion years ago, according to Nadja Drabon, assistant professor of Earth and planetary sciences at Harvard University. She is also lead author of a new study describing the S2 impact and what followed in its aftermath that published Monday in the journal Proceedings of the National Academy of Sciences.
“No complex life had formed yet, and only single-celled life was present in the form of bacteria and archaea,” Drabon wrote in an email. “The oceans likely contained some life, but not as much as today in part due to a lack of nutrients. Some people even describe the Archean oceans as ‘biological deserts.’ The Archean Earth was a water world with few islands sticking out. It would have been a curious sight, as the oceans were probably green in color from iron-rich deep waters.”
When the S2 meteorite hit, global chaos ensued — but the impact also stirred up ingredients that might have enriched bacterial life, Drabon said. The new findings could change the way scientists understand how Earth and its fledgling life responded to bombardment from space rocks not long after the planet formed.
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Medical staff on the front line of the battle against mpox in eastern Democratic Republic of Congo have told the BBC they are desperate for vaccines to arrive so they can stem the rate of new infections.
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At a treatment centre in South Kivu province that the BBC visited in the epicentre of the outbreak, they say more patients are arriving every day - especially babies - and there is a shortage of essential equipment.
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Mpox - formerly known as monkeypox - is a highly contagious disease and has killed at least 635 people in DR Congo this year.
Even though 200,000 vaccines, donated by the European Commission, were flown into the capital, Kinshasa, last week, they are yet to be transported across this vast country - and it could be several weeks before they reach South Kivu.
“We've learned from social media that the vaccine is already available,” Emmanuel Fikiri, a nurse working at the clinic that has been turned into a specialist centre to tackle the virus, told the BBC.
He said this was the first time he had treated patients with mpox and every day he feared catching it and passing it on to his own children - aged seven, five and one.
“You saw how I touched the patients because that's my job as a nurse. So, we're asking the government to help us by first giving us the vaccines.”
The reason it will take time to transport the vaccines is that they need to be stored at a precise temperature - below freezing - to maintain their potency, plus they need to be sent to rural areas of South Kivu, like Kamituga, Kavumu and Lwiro, where the outbreak is rife.
The lack of infrastructure and bad roads mean that helicopters could possibly be used to drop some of the vaccines, which will further drive up costs in a country that is already struggling financially.
At the community clinic, Dr Pacifique Karanzo appeared fatigued and downbeat having been rushed off his feet all morning.
Although he wore a face shield, I could see the sweat running down his face. He said he was saddened to see patients sharing beds.
“You will even see that the patients are sleeping on the floor,” he told me, clearly exasperated.
“The only support we have already had is a little medicine for the patients and water. As far as other challenges are concerned, there's still no staff motivation.”
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