Comet, Dinosaur, Earth, Theory comet that killed the dinosaurs
My channel also press bell icon for future video notifications thanks. It was tens of miles wide and forever changed history when it crashed into earth. About 66 million years ago, the chiksulib impactor, as it’s known left, behind a crater off the coast of mexico that spans 93 miles and goes 12 miles deep. Its devastating impact brought the reign of the dinosaurs to an abrupt and calamitous end by triggering their sudden mass extinction. Along with the end of almost three quarters of the plant and animal species, then living on earth, the enduring puzzle has always been where the asteroid or comet that set off the destruction originated and how it came to strike the earth. And now a pair of harvard researchers believe they have the answer. In a study published in scientific reports, avi loeb, frank, b, baird jr, professor of science at harvard and amir siraj 21, an astrophysics concentrator put forth a new theory that could explain the origin and journey of this catastrophic object and others like it. Using statistical analysis and gravitational simulations, loeb and siraj show that a significant fraction of a type of comet originating from the oort cloud, a sphere of debris at the edge of the solar system, was bumped off course by jupiter’s gravitational field during its orbit and sent close To that increases, the rate of comets like chiksulub, pronounced chicks, a lub, because these fragments cross the earth’s orbit and hit the planet once every 250 to 730 million years or so basically, jupiter acts as a kind of pinball machine, said saraj, who is also co.
President of harvard students for the exploration and development of space and is pursuing a master’s degree at the new england, conservatory of music jupiter kicks these incoming long period, comets into orbits that bring them very close to the sun it’s. Because of this that long period, comets, which take more than 200 years to orbit the sun, are called sun grazers. He said when you have these sun grazers it’s, not so much the melting that goes on, which is a pretty small fraction relative to the total mass. But the comet is so close to the sun that the part that’s closer to the sun feels a stronger gravitational pull than the part that is farther from the sun, causing you get what’s called a tidal disruption event, and so these large comets that come really close To the sun break up into smaller comets and basically on their way out, there’s a statistical chance that these smaller comets hit the earth. The calculations from loeb and saras theory increase the chances of long period comets impacting earth by a factor of about 10 and show that about 20 of long period, comets become sun ji that finding falls in line with research from other astronomers. The pair claim that their new rate of impact is consistent with the age of chiksulub, providing a satisfactory explanation for its origin and other impactors like it. Our paper provides a basis for explaining the occurrence of this event. Loeb said we are suggesting that, in fact, if you break up an object as it comes close to the sun, it could give rise to the appropriate event rate and also the kind of impact that killed.
The dinosaurs, loeb and saras hypothesis might also explain the makeup of many of these impactors. Our hypothesis predicts that other chiksulub size craters on earth are more likely to correspond to an impactor with a primitive carbonaceous chondrite composition than expected from the conventional main belt. Asteroids. The researchers wrote in the paper. This is important because a popular theory on the origin of chiksulub claims the impactor as a fragment of a much larger asteroid that came from the main belt, which is an asteroid population between the orbit of jupiter and mars. Only about a tenth of all main built asteroids have a composition of carbonaceous chondrite, while it’s assumed most long period comets have it evidence found at the chiksulub, crater and other similar craters that suggests they had carbonaceous chondrite. This includes an object that hit about 2 billion years ago and left the redefer crater in south africa, which is the largest confirmed crater in earth’s history and the impactor that left the zamanchin crater in kazakhstan, which is the largest confirmed crater within the last million years. The researchers say that composition, evidence supports their model and that the years the objects hit support both their calculations on impact rates of chiksulub size, tidally, disrupted, comets and for smaller ones, like the impactor that made the zaminchan crater. If produced the same way, they say those would strike earth once every two hundred, fifty thousand to seven hundred thirty thousand years, loeb and saraj say their hypothesis can be tested by further studying these craters others like them and even ones on the surface of the moon.
To determine the composition of the impactors space mission, sampling comets can also help aside from composition of comets. The new vera rubin observatory in chile may be able to see the tidal disruption of long period comets after it becomes operational next year. We should see smaller fragments coming to earth more frequently from the oort cloud. Loeb said, i hope that we can test the theory by having more data on long period, comets get better statistics and perhaps see evidence for some fragments. Loeb said understanding. This is not just crucial to solving a mystery of earth’s history, but could prove pivotal if such an event were to threaten the. It must have been an amazing sight, but we don’t want to see that side. He said: please support my channel to grow by pressing, subscribe button and the bell icon. We will notify you technological news.