The moment the world ended: 100 trillion tons of TNT
In short: Imagine a fireball brighter than the sun streaking across the sky before a mountain-sized asteroid slams into the Yucatán Peninsula. In a single instant, the Mesozoic era ended, triggering a chain of global catastrophes that wiped out 80 percent of all life on Earth.
The impact occurred approximately 66 million years ago, striking eastern Mexico with an explosive yield estimated to exceed 100 trillion tons of TNT. This wasn't just a surface collision; the asteroid penetrated the Earth's crust to a depth of several miles. The sheer force of the strike vaporized thousands of cubic miles of rock and gouged out a crater spanning more than 115 miles across.
In the seconds following the impact, the Earth's crust underwent a violent physical reaction. The ground rebounded, creating a 'peak ring'—a large circular structure within the crater walls formed by the swelling of the shocked earth. Scientists are currently studying the 'topsy-turvy' geology of these rings to reconstruct the phenomenal forces unleashed during the first moments of the disaster.
While the asteroid theory gained mainstream traction in 1980, it wasn't until the 1990s that the identification of the Chicxulub Crater provided the specific 'when' and 'where' for the extinction event. This discovery allowed researchers to move beyond speculation to model the immediate aftermath: a world where the blood-warm seas and coniferous forests were replaced by a sequence of global catastrophes.
The primary mystery remains the specific mechanism of the fallout. While we know the impact initiated a chain of events that decimated the majority of dinosaurs and outsized insects, the exact progression of how that fallout killed off such a vast percentage of life remains a subject of intense scientific inquiry.
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Sources
- Summary by Intellect · source: What happened In The First Minutes After The Dinosaurs Disappeared?
- Also: Here’s What Happened the Day the Dinosaurs Died
- Also: Natural History Museum (London): How an asteroid ended the age of the dinosaurs | Natural History Museum
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