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Home / Science / "Death of Mars" – A car-sized asteroid ignites ancient climate change (Weekend Feature Film)

"Death of Mars" – A car-sized asteroid ignites ancient climate change (Weekend Feature Film)



  Ancient Marsozean

In the mid-1

980s, a group of American archaeologists discovered a pattern on satellite imagery to understand what had become of the Mayan civilization that once ruled the Mexican Yucatan Peninsula: a near-perfect ring of sinkholes , about 200 km long, surrounds the capital of Yucatecan, Merida, and the port cities of Sisal and Progreso. A pattern created by an ancient asteroid explosion that may provide clues to the lost ocean and atmosphere of Mars.

When the researchers presented their findings at a scientific conference in Acapulco, Mexico, to other satellite experts in 1988, a scholar in the audience, Adriana Ocampo, then a young planet geologist at NASA, saw the circular formation not just a giant ring, but a ring Porthole – the impact crater of an asteroid that struck with the power of 10 billion Hiroshima nuclear bombs that scarred the planet in a way that was uncovered 66 million years later. Today, the center of the Bullseye is buried one kilometer below a tiny town called Chicxulub Puerto.

"When I saw the slides, that was mine, Aha! & # 39; – moment. It could be, "said Ocampo, now director of NASA's Lucy Mission, who will ship a spaceship to Jupiter's orbit in 2021, the BBC. "I was very excited, but I was cool because you obviously do not know until you have more evidence, you did not even know what I was talking about!" She laughed three decades later.

The key to her "Aha! Moment had been an intuition that, in collaboration with a legendary figure of space science, Eugene Shoemaker, the pioneering American geologist who, as one of the founders of the field of planetary science 21 years after his death, the only person whose ashes on Ocampo had instructed that it is unlikely that nearly perfect circles were caused by other terrestrial forces, and could provide clues to the geological evolution of the Earth.

Ocampo's chance encounter was the beginning of a scientific correspondence that would provide the foundation for what most scientists today believe: this ring corresponds to the edge of the crater caused by an asteroid, which was driven by Peter Brannen in the ends of the The asteroid itself was so large that even at the moment of impact, the 747's peak could have been piled up more than a mile above cruising altitude. During her almost instantaneous descent, she collapses. The air beneath her became so violent that it briefly became hotter than the surface of the sun. "The Asteroid That Towered hit Earth with enough force to lift a mountain back to space at escape speed One mile above the cruising altitude of a 747

In the years following the cataclysmic effects, the BBC reports, the Earth would have changed beyond recognition, with the ash cloud blocking the sky and causing more than the Eternal Night One year For a long time, temperatures dropped below freezing, killing 75% of Earth's life – including almost all dinosaurs.

The scientists drilled into the Chicxulub crater, which lies buried under the Yucatán peninsula, and found there rocks from the Gulf of Mexico were hit by the asteroid and created the niche that allowed the rise of Homo Sapiens. The 15 km wide asteroid could not have hit a worse place on earth. "All these fossils occur in a layer not more than 10 cm thick," said paleontologist Ken Lacovara. "They died suddenly and were quickly buried. It tells us that this is a moment in geological time. These are days, weeks, maybe months. But that's not thousands of years; It is not hundreds of thousands of years. This is essentially an instantaneous event. "

Without this influence humanity would probably never have existed. "It gave us a leg to keep up in order to thrive as we did in the end," she said.

"Lost!" )

Debris found on Mars asteroid impacts compared to ejected from the Chicxulub Crater has similarities indicating that Mars used to have a much thicker atmosphere needs than today – one closer to the atmosphere that supports life on earth. "It's important for us to know what has happened in the past to prepare for the future," said Ocampo. "It provides a really good insight into what happened in the geological evolution of Mars."

"It's a natural lab because it's similar to what we can find on other planets like Mars where humans can not go," Ocampo said of Mexico's smaller crater.

Today, Mars is a cold desert with a 100 times thinner carbon dioxide atmosphere than Earth. However, there is evidence that the Martian surface in the early history of our solar system probably housed an ocean as deep as the Mediterranean Sea. However, as the planet's atmosphere waned, most of the ocean went into space. The rest of the water is trapped in the Marseilles caps.

Astronomers from UC Santa Cruz, Caltech, and MIT suggested that a gigantic meteorite or comet the size of a Pluto with a diameter of more than 1,200 miles converged on ancient Mars at 21,600 miles per hour, about 3.9 Billions of years ago it plunged steeply into the planet and blasted the huge 5,500-mile elliptical scar that now forms the entire northern lowlands of the planet, while the southern highlands remain relatively undamaged. An impact that is so great that it left half the red planet at a lower altitude.

If the theories are correct, he has blown up the largest crater a planet has ever survived. It was a tremor much bigger than the one that drowned the dinosaurs on Earth. A region of the surface is the huge, oval scar of the impact itself, covering more than a third of the surface of Mars and enclosing all of the huge, low-lying areas of the high north of the planet where the spaceship Phoenix is ​​now excavating buried nuggets of ice. The other is the even larger upland region in the south, characterized by deep ravines, high mountains and the remnants of huge volcanoes.

Discovery of Mars – giant lake with liquid water, observed under the South Pole: "We did not see the thing That was right under our noses"

The Mars Reconnaissance Orbiter and the NASA Mars Global Surveyor have provided detailed information on the heights and severity of the northern and southern hemispheres of the Red Planet. The mystery of Mars's two-sided nature has puzzled scientists since the first sweeping surface images of the 1970s were blasted home by NASA spacecraft. A huge northern basin covering about 40 percent of the Martian surface, also called the Borealis Basin, is a remnant of a colossal impact at the dawn of the Solar System, the new analysis says. With a diameter of 8,500 kilometers, it is about four times wider than the next largest known impact basin, the Hellas Basin on southern Mars.

"Collision Worlds" – Why Northern Mars is Lower in Altitude than Southern Mars

In an accompanying report it was calculated that the impacting object from which the Borealis Basin originated must have a diameter of about 2,000 kilometers. That's bigger than Pluto. It seems to have held an ocean the size of the united areas of Asia, Europe and Australia, the early days of the planet, before Mars lost so much of its atmosphere and either sublimated the water or froze it below the surface. 19659003] Chicxulub information could also provide clues as to whether or not water was on the surface of Mars long after the planet was hit by the massive asteroid.

Scientists have discovered frozen water on the surface of the red planet. The Martian oceans could have disappeared when the planet was bombarded by smaller meteors that altered and dried out its atmosphere, Ocampo said.

The Daily Galaxy via the BBC http://www.bbc.com/travel/story/20181111-the-buried-secrets-of-the-deadliest-place-on-the-ground and https: //solarsystem.nasa. gov / people / 1780 / adriana ocampo / [19659027[(function(d, s, id) {
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