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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.
A study reveals the chemical makeup of the Chicxulub asteroid that collided with Earth and resulted in the ... (9.7 and 14.5 kilometers) in diameter. But its colossal size is why it largely ...
Chicxulub crater: 182 km (113 mi) 1.4% Cause or contributor of the Cretaceous–Paleogene extinction event: Sudbury Basin: 130 km (80 mi) 1% Moon (moon of Earth) Procellarum: 3,000 km (2,000 mi) 3,470 km 86% Not confirmed as an impact basin. South Pole–Aitken basin: 2,500 km (1,600 mi) 70% Imbrium: 1,145 km (711 mi) 33% Mars: North Polar Basin
The closest that humans have come to seeing an asteroid this large crashing to Earth was in 1908, when a 164-foot-wide asteroid exploded over Siberia. ... compared to the Mexican “Chicxulub ...
The meteorite was estimated to have been up to 200 times larger than the extinction-inducing Chicxulub asteroid. That massive size made it plenty large enough to trigger a devastating tsunami that ...
This impactor excavated the Chicxulub crater that is 180 km (110 mi) in diameter. With an object this size, dust and debris would still be ejected into the atmosphere even if it hit the ocean, which is only 4 km (2.5 mi) deep. [3] An asteroid, meteor, or comet would remain intact through the atmosphere by virtue of its
However, the most widely accepted theory for the mass extinction is that an asteroid (or, perhaps a comet) at least 10 kilometers in diameter crashed near modern-day Chicxulub on the Yucatán ...
Luis Walter Alvarez, left, and his son Walter, right, at the K–T Boundary in Gubbio, Italy, 1981. The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.