//www.koonmotors.com/news/earth_climate/near-earth_object_impacts/ Near-Earth Objects. Near Earth Asteroids. Meteorites have impacted planet Earth many times. Scientists review the geological records and make predictions of risks of near Earth object impacts. en-us Wed, 06 Sep 2023 14:54:42 EDT Wed, 06 Sep 2023 14:54:42 EDT 60 //www.koonmotors.com/images/scidaily-logo-rss.png//www.koonmotors.com/news/earth_climate/near-earth_object_impacts/ For more science news, visit ScienceDaily. //www.koonmotors.com/releases/2023/08/230801163251.htm Earth's oldest craters could give scientists critical information about the structure of the early Earth and the composition of bodies in the solar system as well as help to interpret crater records on other planets. But geologists can't find them, and they might never be able to, according to a new study. Tue, 01 Aug 2023 16:32:51 EDT //www.koonmotors.com/releases/2023/08/230801163251.htm //www.koonmotors.com/releases/2023/07/230731151552.htm Earth is rapidly warming and scientists are developing a variety of approaches to reduce the effects of climate change. An astronomer has proposed a novel approach -- a solar shield to reduce the amount of sunlight hitting Earth, combined with a tethered, captured asteroid as a counterweight. Engineering studies using this approach could start now to create a workable design that could mitigate climate change within decades. Mon, 31 Jul 2023 15:15:52 EDT //www.koonmotors.com/releases/2023/07/230731151552.htm //www.koonmotors.com/releases/2023/06/230627123015.htm A Cretaceous origin for placental mammals, the group that includes humans, dogs and bats, has been revealed by in-depth analysis of the fossil record, showing they co-existed with dinosaurs for a short time before the dinosaurs went extinct. Tue, 27 Jun 2023 12:30:15 EDT //www.koonmotors.com/releases/2023/06/230627123015.htm //www.koonmotors.com/releases/2023/03/230315132425.htm A new study brings scientists one step closer to answering the question of where Earth's water came from. Wed, 15 Mar 2023 13:24:25 EDT //www.koonmotors.com/releases/2023/03/230315132425.htm //www.koonmotors.com/releases/2023/03/230307144354.htm The Phlegraean volcanic fields just west of Naples, Italy, are among the top eight emitters of volcanic carbon dioxide in the world. Since 2005, the Solfatara crater -- one of many circular depressions in the landscape left by a long history of eruptions --has been emitting increased volumes of gas. Today it emits 4,000-5,000 tons of carbon dioxide each day, equivalent to the emissions from burning ~500,000 gallons of gasoline. Researchers estimate that as much as 20%--40% of the current carbon dioxide emissions are from the dissolution of calcite in the rocks, while 60%--80% is from underground magma. Tue, 07 Mar 2023 14:43:54 EST //www.koonmotors.com/releases/2023/03/230307144354.htm //www.koonmotors.com/releases/2023/03/230301141413.htm In 2022 NASA embarked on a bold experiment to see if they could change an asteroid's velocity by smacking it with a ballistic probe -- kind of like hitting it with a hammer. This experiment was to test a potential technique to someday deflect an asteroid on a collision course to Earth. Perhaps, for the first time in the history of the universe, an intelligent planetary species sought ways to avoid its own potential extinction by threats from outer space (something the dinosaurs, who were wiped out 65 million years ago by a rogue asteroid, never evolved to accomplish). Wed, 01 Mar 2023 14:14:13 EST //www.koonmotors.com/releases/2023/03/230301141413.htm //www.koonmotors.com/releases/2023/03/230301120854.htm Astronomers offer new insight into how deflection missions can protect the planet from future Earth-bound asteroids and comets. Wed, 01 Mar 2023 12:08:54 EST //www.koonmotors.com/releases/2023/03/230301120854.htm //www.koonmotors.com/releases/2023/02/230222115945.htm Countless meteorites have struck Earth in the past and shaped the history of our planet. It is assumed, for example, that meteorites brought with them a large part of its water. The extinction of the dinosaurs might also have been triggered by the impact of a very large meteorite. It turns out that the marketing 'gag' of the 'Domaine du Météore' winery is acutally a real impact crater. Meteorite craters which are still visible today are rare because most traces of the celestial bodies have long since disappeared again. Wed, 22 Feb 2023 11:59:45 EST //www.koonmotors.com/releases/2023/02/230222115945.htm //www.koonmotors.com/releases/2023/01/230127131132.htm By analyzing meteorites, researchers have uncovered the likely far-flung origin of Earth's volatile chemicals, some of which form the building blocks of life. Fri, 27 Jan 2023 13:11:32 EST //www.koonmotors.com/releases/2023/01/230127131132.htm //www.koonmotors.com/releases/2023/01/230123151524.htm New research into the durability and age of an ancient asteroid made of rocky rubble and dust, revealed significant findings that could contribute to potentially saving the planet if one ever hurtled toward Earth. Mon, 23 Jan 2023 15:15:24 EST //www.koonmotors.com/releases/2023/01/230123151524.htm //www.koonmotors.com/releases/2023/01/230118092044.htm Antarctica is a tough place to work, for obvious reasons -- it's bitterly cold, remote, and wild. However, it's one of the best places in the world to hunt for meteorites. That's partly because Antarctica is a desert, and its dry climate limits the degree of weathering the meteorites experience. On top of the dry conditions, the landscape is ideal for meteorite hunting: the black space rocks stand out clearly against snowy fields. Wed, 18 Jan 2023 09:20:44 EST //www.koonmotors.com/releases/2023/01/230118092044.htm //www.koonmotors.com/releases/2022/12/221222101015.htm As the supersonic solar wind surges towards Earth, its interaction with our planet's magnetic field creates a shock to deflect its flow, and a foreshock filled with electromagnetic waves. How these waves can propagate to the other side of the shock has long remained a mystery. Thu, 22 Dec 2022 10:10:15 EST //www.koonmotors.com/releases/2022/12/221222101015.htm //www.koonmotors.com/releases/2022/11/221103105004.htm A peculiar property of the Earth's magnetic field could help us to work out how our planet was created 4.5 billion years ago, according to a new scientific assessment. Thu, 03 Nov 2022 10:50:04 EDT //www.koonmotors.com/releases/2022/11/221103105004.htm //www.koonmotors.com/releases/2022/11/221101100742.htm On September 26, NASA's Double Asteroid Redirection Test (DART) spacecraft crashed into Dimorphos, a moonlet of the near-Earth asteroid Didymos, at 14,000 miles per hour. Prior to the impact, engineers and scientists performed an experiment to study the cratering process that produces the mass of ejected materials and measures the subsequent momentum enhancement of the impact. Tue, 01 Nov 2022 10:07:42 EDT //www.koonmotors.com/releases/2022/11/221101100742.htm //www.koonmotors.com/releases/2022/10/221006160638.htm Some 66 million years ago, a 10-kilometer asteroid hit Earth, triggering the extinction of the dinosaurs. New evidence suggests that the Chicxulub impact also triggered an earthquake so massive that it shook the planet for weeks to months after the collision. The amount of energy released in this 'mega-earthquake' is estimated at 10 to the exponent 23 joules, which is about 50,000 times more energy than was released in the magnitude 9.1 Sumatra earthquake in 2004. Thu, 06 Oct 2022 16:06:38 EDT //www.koonmotors.com/releases/2022/10/221006160638.htm //www.koonmotors.com/releases/2022/10/221004104943.htm Most theories claim the Moon formed out of the debris of a collision between the Earth and an object about the size of Mars, called Theia, coalescing in orbit over months or years. A new simulation puts forth a different theory -- the Moon may have formed immediately, in a matter of hours, when material from the Earth and Theia was launched directly into orbit after the impact. Tue, 04 Oct 2022 10:49:43 EDT //www.koonmotors.com/releases/2022/10/221004104943.htm //www.koonmotors.com/releases/2022/08/220824102928.htm New research has found evidence that Earth's early continents resulted from being hit by comets as our Solar System passed into and out of the spiral arms of the Milky Way Galaxy, turning traditional thinking about our planet's formation on its head. Wed, 24 Aug 2022 10:29:28 EDT //www.koonmotors.com/releases/2022/08/220824102928.htm //www.koonmotors.com/releases/2022/08/220810161042.htm Researchers discover the first definitive proof that the Moon inherited indigenous noble gases from the Earth's mantle. The discovery represents a significant piece of the puzzle towards understanding how the Moon and, potentially, the Earth and other celestial bodies were formed. Wed, 10 Aug 2022 16:10:42 EDT //www.koonmotors.com/releases/2022/08/220810161042.htm //www.koonmotors.com/releases/2022/08/220808162108.htm When a small asteroid enters Earth's atmosphere from space, its surface is brutally heated, causing melting and fragmenting. Therefore, it was somewhat of a mystery why the rocks near the surface survive to the ground as meteorites. That mystery is solved in a new study of the fiery entry of asteroid 2008 TC3. Mon, 08 Aug 2022 16:21:08 EDT //www.koonmotors.com/releases/2022/08/220808162108.htm //www.koonmotors.com/releases/2022/07/220712190520.htm What do Mars and Iceland have in common? These days, not so much. But more than 4.5 billion years ago, it's possible the Red Planet had a crust comparable to Iceland today. This discovery, hidden in the oldest martian fragments found on Earth, could provide information about our planet that was lost over billions of years of geological movement and could help explain why the Earth developed into a planet that sustains a broad diversity of life and Mars did not. Tue, 12 Jul 2022 19:05:20 EDT //www.koonmotors.com/releases/2022/07/220712190520.htm //www.koonmotors.com/releases/2022/06/220609155817.htm While much of public attention on Yellowstone focuses on its potential to produce large supereruptions, the hazards that are much more likely to occur are smaller, violent hydrothermal explosions. Hydrothermal explosions occur when near-boiling water suddenly flashes into steam, releasing large amounts of energy. The energy release fractures the rock downward, often leaving behind a crater. The same sources that can produce these explosions are what give Yellowstone its well-known hot springs, geysers, and fumaroles. Thu, 09 Jun 2022 15:58:17 EDT //www.koonmotors.com/releases/2022/06/220609155817.htm //www.koonmotors.com/releases/2022/05/220517094813.htm Scientists have demonstrated that a new geochemical archive -- 182-Tungsten in banded iron formations -- can be used to simultaneously trace both the evolution of the Earth's mantle and continents throughout Earth's history. This offers new opportunities to better understand the Precambrian Earth in the future. Tue, 17 May 2022 09:48:13 EDT //www.koonmotors.com/releases/2022/05/220517094813.htm //www.koonmotors.com/releases/2022/04/220428142822.htm Scientists show that remnants of the roots of Earth's first crust are still present in the terrestrial mantle and contribute to magmas erupted at the surface over Earth's history. Thu, 28 Apr 2022 14:28:22 EDT //www.koonmotors.com/releases/2022/04/220428142822.htm //www.koonmotors.com/releases/2022/04/220427211301.htm Hydrogen and oxygen ions escaping from Earth's upper atmosphere and combining on the moon could be one of the sources of the known lunar water and ice, according to new research. Wed, 27 Apr 2022 21:13:01 EDT //www.koonmotors.com/releases/2022/04/220427211301.htm //www.koonmotors.com/releases/2022/03/220328133609.htm 氦- 3,这是一种罕见的同位素的氦气泄漏out of Earth's core, a new study reports. Because almost all helium-3 is from the Big Bang, the gas leak adds evidence that Earth formed inside a solar nebula, which has long been debated. Mon, 28 Mar 2022 13:36:09 EDT //www.koonmotors.com/releases/2022/03/220328133609.htm //www.koonmotors.com/releases/2022/03/220309140838.htm Researchers have dated the enormous Hiawatha impact crater, a 31-kilometer-wide meteorite crater buried under a kilometer of Greenlandic ice. The dating ends speculation that the meteorite impacted after the appearance of humans and opens up a new understanding of Earth's evolution in the post-dinosaur era. Wed, 09 Mar 2022 14:08:38 EST //www.koonmotors.com/releases/2022/03/220309140838.htm //www.koonmotors.com/releases/2022/02/220214144030.htm 几十个小的撞击坑,如果10——70米ze, have been discovered in southeastern Wyoming. A team of U.S. and German geoscientists found these ancient craters in exposed sedimentary layers from the Permian period (280 million years ago). After discovering the first craters, the team initially suspected that they are a crater-strewn field, formed by the breakup of an asteroid that entered the atmosphere. However, with the discovery of more and more craters over a wide area, this interpretation was ruled out. Mon, 14 Feb 2022 14:40:30 EST //www.koonmotors.com/releases/2022/02/220214144030.htm //www.koonmotors.com/releases/2022/02/220201144027.htm 因为月球地球上的生命是如此重要,scientists conjecture that a moon may be a potentially beneficial feature in harboring life on other planets. Most planets have moons, but Earth's moon is distinct in that it is large compared to the size of Earth; the moon's radius is larger than a quarter of Earth's radius, a much larger ratio than most moons to their planets. New research finds that distinction significant. Tue, 01 Feb 2022 14:40:27 EST //www.koonmotors.com/releases/2022/02/220201144027.htm //www.koonmotors.com/releases/2022/02/220201143951.htm The rapid decline of the Hopewell culture about 1,500 years ago might be explained by falling debris from a near-Earth comet that created a devastating explosion over North America, laying waste to forests and Native American villages alike. Researchers found evidence of a cosmic airburst at 11 Hopewell archaeological sites in three states stretching across the Ohio River Valley. Tue, 01 Feb 2022 14:39:51 EST //www.koonmotors.com/releases/2022/02/220201143951.htm //www.koonmotors.com/releases/2021/12/211213121801.htm A new study has found that the minerology of the rocks that a meteorite hits, rather than the size of the impact, determines how deadly an impact it will have. Mon, 13 Dec 2021 12:18:01 EST //www.koonmotors.com/releases/2021/12/211213121801.htm //www.koonmotors.com/releases/2021/11/211122135529.htm A scientist has discovered a method for detecting and better defining meteorite impact sites that have long lost their tell-tale craters. The discovery could further the study of not only Earth's geology but also that of other bodies in our solar system. Mon, 22 Nov 2021 13:55:29 EST //www.koonmotors.com/releases/2021/11/211122135529.htm //www.koonmotors.com/releases/2021/11/211102180530.htm Heat from a comet exploding just above the ground fused the sandy soil into patches of glass stretching 75 kilometers, a new study found. Tue, 02 Nov 2021 18:05:30 EDT //www.koonmotors.com/releases/2021/11/211102180530.htm //www.koonmotors.com/releases/2021/10/211021120905.htm A team has updated its asteroid bombardment model of the Earth with the latest geologic evidence of ancient, large collisions. These models have been used to understand how impacts may have affected oxygen levels in the Earth's atmosphere in the Archean eon, 2.5 to 4 billion years ago. Thu, 21 Oct 2021 12:09:05 EDT //www.koonmotors.com/releases/2021/10/211021120905.htm //www.koonmotors.com/releases/2021/10/211006112718.htm New research suggests that Earth's 'solid' inner core is, in fact, endowed with a range of liquid, soft, and hard structures which vary across the top 150 miles of the inner core. Wed, 06 Oct 2021 11:27:18 EDT //www.koonmotors.com/releases/2021/10/211006112718.htm //www.koonmotors.com/releases/2021/09/210930104851.htm Researchers used decades of measurements of earthshine -- the light reflected from Earth that illuminates the surface of the Moon to find that there has been a significant drop in Earth's reflectance over the past two decades. The Earth is now reflecting about half a watt less light per square meter than it was 20 years ago, with most of the drop occurring in the last three years. Thu, 30 Sep 2021 10:48:51 EDT //www.koonmotors.com/releases/2021/09/210930104851.htm //www.koonmotors.com/releases/2021/07/210707112402.htm Why magma flowed along a curved pathway during the 2018 eruption of a Galapagos volcano is explained by a new model. Wed, 07 Jul 2021 11:24:02 EDT //www.koonmotors.com/releases/2021/07/210707112402.htm //www.koonmotors.com/releases/2021/06/210608113203.htm For the first time, a unique study has tracked the meteorite flux to Earth over the past 500 million years. Contrary to current theories, researchers have determined that major collisions in the asteroid belt have not generally affected the number of impacts with Earth to any great extent. Tue, 08 Jun 2021 11:32:03 EDT //www.koonmotors.com/releases/2021/06/210608113203.htm //www.koonmotors.com/releases/2021/06/210604122500.htm A research group has demonstrated that the heat generated by the impact of a small astronomical body could enable aqueous alteration and organic solid formation to occur on the surface of an asteroid. These results have significantly increased the number of prospective astronomical bodies that could have brought water and the origins of life to Earth. Fri, 04 Jun 2021 12:25:00 EDT //www.koonmotors.com/releases/2021/06/210604122500.htm //www.koonmotors.com/releases/2021/05/210526093111.htm Tiny charged electrons and protons which can damage satellites and alter the ozone have revealed some of their mysteries to scientists. Wed, 26 May 2021 09:31:11 EDT //www.koonmotors.com/releases/2021/05/210526093111.htm //www.koonmotors.com/releases/2021/05/210520133657.htm Researchers report that they can detect showers from the debris in the path of comets that pass close to Earth orbit and return as infrequently as once every 4,000 years. Thu, 20 May 2021 13:36:57 EDT //www.koonmotors.com/releases/2021/05/210520133657.htm //www.koonmotors.com/releases/2021/05/210514134027.htm High-precision noble gas analyses indicate that solar wind particles from our primordial Sun were encased in the Earth's core over 4.5 billion years ago. Researchers have concluded that the particles made their way into the overlying rock mantle over millions of years. The scientists found solar noble gases in an iron meteorite they studied. Because of their chemical composition, such meteorites are often used as natural models for the Earth's metallic core. Fri, 14 May 2021 13:40:27 EDT //www.koonmotors.com/releases/2021/05/210514134027.htm //www.koonmotors.com/releases/2021/04/210426140901.htm An international team of researchers searched for pieces of a small asteroid tracked in space and then observed to impact Botswana on June 2, 2018. Mon, 26 Apr 2021 14:09:01 EDT //www.koonmotors.com/releases/2021/04/210426140901.htm //www.koonmotors.com/releases/2021/04/210421151254.htm Scientists detect small pockets of carbon dioxide-rich liquid water in a meteorite dating from the early solar system. Wed, 21 Apr 2021 15:12:54 EDT //www.koonmotors.com/releases/2021/04/210421151254.htm //www.koonmotors.com/releases/2021/04/210408112415.htm The 15-million-year-old Nördlinger Ries is an asteroid impact crater filled with lake sediments. A research team has now discovered a volcanic ash layer in the crater. In addition, they show that the ground under the crater is sinking in the long-term, which provides important insights about craters on Mars, such as those currently being explored by the NASA Curiosity and Perseverance Rovers. Thu, 08 Apr 2021 11:24:15 EDT //www.koonmotors.com/releases/2021/04/210408112415.htm //www.koonmotors.com/releases/2021/03/210331143036.htm A research team of international space scientists has found new evidence of a low-altitude meteoritic touchdown event reaching the Antarctic ice sheet 430,000 years ago. Wed, 31 Mar 2021 14:30:36 EDT //www.koonmotors.com/releases/2021/03/210331143036.htm //www.koonmotors.com/releases/2021/03/210330171009.htm Anthropogenic climate change is one of the foremost scientific and societal challenges. In part, our response to this global challenge requires an enhanced understanding of how the Earth's surface responds to episodes of climatic heating and cooling. Tue, 30 Mar 2021 17:10:09 EDT //www.koonmotors.com/releases/2021/03/210330171009.htm //www.koonmotors.com/releases/2021/03/210316132121.htm Lightning strikes were just as important as meteorites in creating the perfect conditions for life to emerge on Earth, according to new research. This shows that life could develop on Earth-like planets through the same mechanism at any time if atmospheric conditions are right. Tue, 16 Mar 2021 13:21:21 EDT //www.koonmotors.com/releases/2021/03/210316132121.htm //www.koonmotors.com/releases/2021/03/210311152812.htm Using the same principles that make polarized sunglasses possible, a team of researchers at the Arecibo Observatory in Puerto Rico have developed a technique that will help better defend against asteroids on a collision course with Earth. A new study in The Planetary Science Journal found a better way to interpret radar signals bounced off asteroids' surfaces. Thu, 11 Mar 2021 15:28:12 EST //www.koonmotors.com/releases/2021/03/210311152812.htm //www.koonmotors.com/releases/2021/03/210311094122.htm Several years after scientists discovered what was considered the oldest crater a meteorite made on the planet, another team found it's actually the result of normal geological processes. Thu, 11 Mar 2021 09:41:22 EST //www.koonmotors.com/releases/2021/03/210311094122.htm //www.koonmotors.com/releases/2021/02/210224143501.htm Researchers believe they have closed the case of what killed the dinosaurs, definitively linking their extinction with an asteroid that slammed into Earth 66 million years ago by finding a key piece of evidence: asteroid dust inside the impact crater. Wed, 24 Feb 2021 14:35:01 EST //www.koonmotors.com/releases/2021/02/210224143501.htm //www.koonmotors.com/releases/2021/02/210216092853.htm A small sub-alpine lake in western Tasmania has helped establish that 41,000 years ago Australia experienced the Laschamp geomagnetic excursion and that Tasmanian, Aboriginals, would've seen it. Tue, 16 Feb 2021 09:28:53 EST //www.koonmotors.com/releases/2021/02/210216092853.htm //www.koonmotors.com/releases/2021/01/210121131947.htm A comparison of chemical and climate weathering of sedimentary rock in Mars' Gale Crater indicate the region's mean temperature billions of years ago was akin to current conditions on Iceland. Thu, 21 Jan 2021 13:19:47 EST //www.koonmotors.com/releases/2021/01/210121131947.htm //www.koonmotors.com/releases/2021/01/210121131748.htm Scientists show evidence that nitrogen acquired during Earth's formation came from both the inner and outer regions of the protoplanetary disk. The study has implications for signs of potential habitability of exoplanets. Thu, 21 Jan 2021 13:17:48 EST //www.koonmotors.com/releases/2021/01/210121131748.htm //www.koonmotors.com/releases/2020/12/201214123512.htm A study gives a new perspective on why our planet has managed to stay habitable for billions of years - concluding it is almost certainly due, at least in part, to luck. The research suggests this may shorten the odds of finding life on so-called 'twin-Earths' in the Universe. Mon, 14 Dec 2020 12:35:12 EST //www.koonmotors.com/releases/2020/12/201214123512.htm //www.koonmotors.com/releases/2020/12/201211083113.htm Mass extinctions of land-dwelling animals--including amphibians, reptiles, mammals, and birds -- follow a cycle of about 27 million years, coinciding with previously reported mass extinctions of ocean life, according to a new analysis. Fri, 11 Dec 2020 08:31:13 EST //www.koonmotors.com/releases/2020/12/201211083113.htm //www.koonmotors.com/releases/2020/12/201204131322.htm Researchers have used magnetism to determine, for the first time, when asteroids that are rich in water and amino acids first arrived in the inner solar system. Fri, 04 Dec 2020 13:13:22 EST //www.koonmotors.com/releases/2020/12/201204131322.htm //www.koonmotors.com/releases/2020/11/201103104725.htm A two-volume atlas presents and explains the impact sites of meteorites and asteroids worldwide. Tue, 03 Nov 2020 10:47:25 EST //www.koonmotors.com/releases/2020/11/201103104725.htm //www.koonmotors.com/releases/2020/09/200930144417.htm When the brightness of the star Betelgeuse dropped dramatically a few months ago, some observers suspected an impending supernova - a stellar explosion that could also cause damage on Earth. While Betelgeuse has returned to normal, physicists have found evidence of a supernova that exploded near the Earth around 2.5 million years ago. Wed, 30 Sep 2020 14:44:17 EDT //www.koonmotors.com/releases/2020/09/200930144417.htm //www.koonmotors.com/releases/2020/09/200916094247.htm It is generally accepted that the inner region of the early solar system was subject to an intense period of meteoric bombardment referred to as the late heavy bombardment. However, researchers have found evidence that suggests this period occurred slightly earlier than thought and was less intense but also more prolonged. Such details about this period could impact theories about the early Earth and the dawn of life. Wed, 16 Sep 2020 09:42:47 EDT //www.koonmotors.com/releases/2020/09/200916094247.htm //www.koonmotors.com/releases/2020/08/200827141334.htm A new study finds that Earth's water may have come from materials that were present in the inner solar system at the time the planet formed -- instead of far-reaching comets or asteroids delivering such water. The findings suggest that Earth may have always been wet. Thu, 27 Aug 2020 14:13:34 EDT //www.koonmotors.com/releases/2020/08/200827141334.htm