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A rebuttal in Astronomy & Geophysics countered that Loeb et al. had ignored that the amount of iridium deposited around the globe, 2.0 × 10 8 –2.8 × 10 8 kg (4.4 × 10 8 –6.2 × 10 8 lb), was too large for a comet of the size implied by the crater, and that they had overestimated likely comet impact rates.
Uniquely, Tanis appears to record in detail, extensive evidence of the direct effects of the giant Chicxulub asteroid impact which struck the Gulf of Mexico 66.043 million years ago, and wiped out all non-avian dinosaurs and many other species (the so-called "K–Pg" or "K–T" extinction).
The Chicxulub crater is an impact crater buried underneath the Mexican Yucatán Peninsula, with its center located offshore, near the town of Chicxulub.The crater is about 180 kilometers (110 mi) in diameter, making it one of the largest confirmed impact structures in the world; the asteroid whose impact (animation shown) formed the crater was at least 10 km (6 mi) in diameter.
A study reveals the chemical makeup of the Chicxulub asteroid that collided with Earth and resulted in the extinction of nearly all dinosaurs 66 million years ago.
Artist's rendering of the Chicxulub asteroid entering Earth's atmosphere 66 million years ago, triggering events that caused a mass extermination. Roger Harris/Science Photo library via Getty ...
Fine dust thrown up into Earth’s atmosphere after an asteroid strike 66 million years ago blocked the sun to an extent that plants were unable to photosynthesize, a new study has found.
Miracle Planet is a six-part documentary series, co-produced by Japan's NHK and the National Film Board of Canada (NFB), narrated by Christopher Plummer (Seiko Nakajo in the original Japanese), which tells the 4.6-billion-year-old story of how life has evolved from its humble beginnings to the diversity of living creatures today.
An animation modelling the impact, and subsequent crater formation of the Chicxulub impact (University of Arizona, Space Imagery Center) The prehistoric Chicxulub impact, 66 million years ago, believed to be the cause of the Cretaceous–Paleogene extinction event, was caused by an asteroid estimated to be about 10 kilometres (6.2 mi) wide. [6]