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Science
85% Informative
Near-Earth asteroid Bennu has a 1 in 2,700 chance of affecting Earth in September 2182 .
Bennu is a fraction of the size of the asteroid that wiped out dinosaurs 66 million years ago .
The researchers modeled the effects of a Bennu-type collision with Earth .
The most intense scenario would lead to a global “impact winter ,” a period of cold temperatures, reduced sunlight and decreased precipitation.
The amount of global cooling estimated in the study is comparable to what occurred when Sumatra’s Mount Toba experienced a super-eruption 74,000 years ago .
Iron is a key nutrient for algae, but in areas such as the Southern Ocean and the eastern tropical Pacific , the mineral is not available in abundance.
Iron could trigger unprecedented blooms of algae, in particular the silicate-rich kind called diatoms.
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