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Sep 10, 2019 · Scientists have a recording of the worst day on Earth; certainly the worst day in the last 66 million years. It takes the form of a 130m section of rock drilled from under the Gulf of Mexico ...
- Worst Possible Place
The Day The Dinosaurs Died is on BBC Two at 21:00, after...
- Demise
Scientists have found an extraordinary snapshot of the...
- Worst Possible Place
- Overview
- Reliving Catastrophe
- End Times
An impact calculator helps scientists paint a vivid picture of the immediate aftermath of the deadly asteroid strike.
Imagine sunrise on the last day of the Mesozoic era, 66 million years ago. Shafts of sunlight rake through the swamps and coniferous forests along the coast of what is now Mexico’s Yucatán Peninsula. The blood-warm seas of the Gulf of Mexico teem with life.
As this lost world of dinosaurs and outsize insects squawks and buzzes and whirs to life, an asteroid the size of a mountain is hurtling toward Earth at about 40,000 miles (64,000 kilometers) an hour.
For a few fleeting moments, a fireball that appears far bigger and brighter than the sun streaks through the sky. An instant later, the asteroid slams into Earth with an explosive yield estimated at over 100 trillion tons of TNT.
The impact penetrates Earth’s crust to a depth of several miles, gouging a crater more than 115 miles (185 kilometers) across and vaporizing thousands of cubic miles of rock. The event sets off a chain of global catastrophes that wipe out 80 percent of life on Earth—including most of the dinosaurs.
This apocalyptic tale has been described in countless books and magazines ever since the asteroid impact theory was first put forth in 1980. The identification of Chicxulub Crater in the Gulf of Mexico during the 1990s then gave scientists an accurate idea of the “when” and the “where.”
What is already known would beggar the imaginations of Hollywood scriptwriters. Using an “impact calculator” developed by a team of geophysicists from Purdue University and Imperial College London, users can enter in a few key details, such as the asteroid’s size and speed, to paint a vivid picture of events.
“You can plug in different distances from the point of impact to see how the effects change over distance,” says Joanna Morgan, one of the lead scientists on the Chicxulub drilling project. “If you were close by, say within 1,000 kilometers [625 miles], you would be instantaneously, or within a few seconds, killed by the fireball.”
Indeed, if you were near enough to see it, you were dead, says Gareth Collins, a lecturer on planetary science at Imperial College who helped develop the program.
Nine seconds after impact, an observer at that distance would have been roasted by a blast of thermal radiation. Trees, grass, and shrubs would have spontaneously burst into flame, and anyone present would have suffered instant third-degree burns over their entire bodies.
After the fire comes the flood. Depending on the local topography, the impact would have kicked up a phenomenal tsunami up to 1,000 feet (305 meters) high. And at the low-end estimate of 10.1 on the Richter scale, the subsequent earthquake would have been more powerful than anything ever measured or experienced by humans.
“A seismic event of this size would be the equivalent of all the world’s earthquakes for the past 160 years going off simultaneously,” says Rick Aster, professor of seismology at Colorado State University and former president of the Seismological Society of America.
While most accounts focus on the spectacular violence of those first few minutes to days after the impact, it was the long-term environmental effects that ultimately wiped out most dinosaurs and much of the rest of life on Earth.
The prevailing dimness caused by the dust cloud meant photosynthesis would have been dramatically reduced. The soot and ash would have taken months to wash out of the atmosphere, and when it did, the rain would have fallen as acidic mud. Massive fires would have produced huge amounts of toxins that temporarily destroyed the planet’s protective ozone layer.
Then there was the carbon footprint of the impact itself, which released an estimated 10,000 billion tons of carbon dioxide, 100 billion tons of carbon monoxide, and another 100 billion tons of methane in one fell swoop, according to geologist David Kring of the Lunar and Planetary Institute.
In effect, the aftermath of the asteroid was probably a powerful one-two punch of nuclear winter followed by dramatic global warming. And that’s where the core samples freshly pulled from Chicxulub Crater can help fill in gaps in this infamous story.
Probably, like modern alligators, large Deinosuchus were generalists that snagged fish, turtles, and whatever carrion it happened upon. We don’t know for sure. Nevertheless, dinosaurs in the ...
Mar 30, 2019 · Sixty-six million years ago, a massive asteroid crashed into a shallow sea near Mexico. The impact carved out a 90-mile-wide crater and flung mountains of earth into space. Earthbound debris fell to the planet in droplets of molten rock and glass. Ancient fish caught glass blobs in their gills as they swam, gape-mouthed, beneath the strange rain.
Aug 16, 2024 · The day the dinosaurs died. What happened in the days, even hours, after an asteroid set off the fifth extinction? A New Jersey quarry, and site of a new museum founded by paleontologist Ken ...
1678. Sixty-six million years ago, dinosaurs had the ultimate bad day. With a devastating asteroid impact, a reign that had lasted 180 million years was abruptly ended. Prof Paul Barrett, a dinosaur researcher at the Museum, explains what is thought to have happened the day the dinosaurs died.
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Mar 29, 2019 · March 29, 2019. A field assistant, Rudy Pascucci, left, and the paleontologist Robert DePalma, right, at DePalma’s dig site. Of his discovery, DePalma said, “It’s like finding the Holy Grail ...
