D. VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY D. VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Chicxulub impact. Artwork of the Chicxulub impact on the Yucatan Peninsula, Mexico, as the meteorite strikes the ground. This impact may have caused the extinction of the dinosaurs and 70% of all Earth's species 65 million years ago. The meteorite was the remnant of an asteroid or comet core which is thought to have been 10-20 kilometres (km) across. The impact created a 180- km wide crater and threw trillions of tonnes of dust into the upper atmosphere. This may have blocked the Sun's light and caused global climate changes. The remains of this debris are found worldwide as a layer in rocks known as the "K/T boundary".
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