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Jordan News
08-02-2025
- Science
- Jordan News
Scientists predict devastation if asteroid Bennu strikes Earth in 2182 - Jordan News
The rocky object called Bennu is classified as a near-Earth asteroid, currently making its closest approach to Earth every six years at about 186,000 miles (299,000 km) away. It might come even closer in the future, with scientists estimating a one-in-2,700 chance of a collision with Earth in September 2182. اضافة اعلان So what would happen should Bennu strike our planet? Well, it would not be pretty, according to new research based on computer simulations of an impact by an asteroid with a diameter of roughly three-tenths of a mile (500 meters) like Bennu. Aside from the immediate devastation, it estimated that such an impact would inject 100-400 million tons of dust into the atmosphere, causing disruptions in climate, atmospheric chemistry and global photosynthesis lasting three to four years. "The solar dimming due to dust would cause an abrupt global 'impact winter' characterized by reduced sunlight, cold temperature and decreased precipitation at the surface," said Lan Dai, a postdoctoral research fellow at the IBS Center for Climate Physics (ICCP) at Pusan National University in South Korea and lead author of the study published this week in the journal Science Advances. In the worst-case scenario, the researchers found that Earth's average surface temperature would decrease by about 7 degrees Fahrenheit (4 degrees Celsius), average rainfall would fall by 15%, there would be a reduction of up to 20-30% in plant photosynthesis and a 32% depletion in the planet's ozone layer that protects against harmful solar ultraviolet radiation. The impact of a Bennu-sized object - a medium-sized asteroid - on Earth's land surface would generate a powerful shockwave, earthquakes, wildfires and thermal radiation, leave a gaping crater and eject huge amounts of debris upward, the researchers said. Reuters
The Independent
06-02-2025
- Science
- The Independent
Asteroid impact would drastically change the world in ways we didn't even expect, scientists say
A medium-sized asteroid could bring dramatic changes to the Earth – in unexpected ways, according to a new simulation. A new simulation looked at what would happen if the Earth collided with an asteroid with a diameter of around 500 metres, roughly the same as Bennu, a real rock that has been studied in great detail. There is a roughly 1-in-2700 chance of such a collision in 2182, and the Earth is hit by similar-sized asteroids about every 100-200 thousand years. Researchers in the new study simulated what would happen to the climate if such a collision happened, and how the potentially 400 million tons of dust that would be released would change the world. They found that it would have dramatic effects for ecosystems on Earth, in ways that could lead to food scarcity and other issues. But it also suggests there could be unexpected bright spots. In the three or four years after the impact, in the most intense scenario, the sun would be dimmed and cool the surface by up to four degrees, reducing rainfall by 15 per cent and deplete the ozone by around 32 per cent. But those are just averages, and particular areas may be dramatically worse. 'The abrupt impact winter would provide unfavorable climate conditions for plants to grow, leading to an initial 20–30% reduction of photosynthesis in terrestrial and marine ecosystems. This would likely cause massive disruptions in global food security,' said Lan Dai, lead author on the study, in a statement. But the oceans may be more hardy, they found – and might actually thrive. Plankton recovered within just six months, and then their numbers increased so that the population was even higher than when the asteroid hit. That was the result of iron concentration on the dust, which would then drop into the oceans. That would provide more food for algae which would bloom and then attract large amounts of the small predators that feed on that algae. 'The simulated excessive phytoplankton and zooplankton blooms might be a blessing for the biosphere and may help alleviate emerging food insecurity related to the longer-lasting reduction in terrestrial productivity,' said Dr Lai. 'On average, medium-sized asteroids collide with Earth about every 100–200 thousand years. This means that our early human ancestors may have experienced some of these planet-shifting events before with potential impacts on human evolution and even our own genetic makeup,' said Axel Timmermann, co-author of the study.
MTV Lebanon
06-02-2025
- Science
- MTV Lebanon
Scientists Predict Devastation if Asteroid Bennu Strikes Earth in 2182
The rocky object called Bennu is classified as a near-Earth asteroid, currently making its closest approach to Earth every six years at about 186,000 miles (299,000 km) away. It might come even closer in the future, with scientists estimating a one-in-2,700 chance of a collision with Earth in September 2182. So what would happen should Bennu strike our planet? Well, it would not be pretty, according to new research based on computer simulations of an impact by an asteroid with a diameter of roughly three-tenths of a mile (500 meters) like Bennu. Aside from the immediate devastation, it estimated that such an impact would inject 100-400 million tons of dust into the atmosphere, causing disruptions in climate, atmospheric chemistry and global photosynthesis lasting three to four years. "The solar dimming due to dust would cause an abrupt global 'impact winter' characterized by reduced sunlight, cold temperature and decreased precipitation at the surface," said Lan Dai, a postdoctoral research fellow at the IBS Center for Climate Physics (ICCP) at Pusan National University in South Korea and lead author of the study published this week in the journal Science Advances, opens new tab. In the worst-case scenario, the researchers found that Earth's average surface temperature would decrease by about 7 degrees Fahrenheit (4 degrees Celsius), average rainfall would fall by 15%, there would be a reduction of up to 20-30% in plant photosynthesis and a 32% depletion in the planet's ozone layer that protects against harmful solar ultraviolet radiation. The impact of a Bennu-sized object - a medium-sized asteroid - on Earth's land surface would generate a powerful shockwave, earthquakes, wildfires and thermal radiation, leave a gaping crater and eject huge amounts of debris upward, the researchers said. Large quantities of aerosols and gases would reach the upper atmosphere, causing years-long effects on climate and ecosystems, according to Dai and study senior author Axel Timmermann, a climate physicist and ICCP director. The unfavorable climate conditions would inhibit plant growth on land and in the ocean, they said. "In contrast to the rapid reduction and slow two-year-long recovery of plants on land, plankton in the ocean would recover within six months - and even increase afterward with unprecedented diatom (a type of algae) blooms triggered by iron-rich dust deposition into the ocean," Dai said. Severe ozone depletion would occur in the stratosphere - the second atmospheric layer as you go upward - due to strong warming caused by the solar absorption of dust particles, the researchers said. An asteroid collision of this magnitude could cause massive loss of human life, but that calculation was outside the study's scope. Dai said the potential death toll "mainly depends on where the asteroid impact occurs." Scientists know a great deal about Bennu, considered a "rubble pile" asteroid - a loose amalgamation of rocky material rather than a solid object. It is a rocky remnant of a larger celestial body that had formed near the dawn of the solar system roughly 4.5 billion years ago. NASA's robotic OSIRIS-REx spacecraft journeyed to Bennu and in 2020 collected samples of rock and dust for analysis. A study published in January showed that Bennu's samples bore some of the chemical building blocks of life, strong evidence that asteroids may have seeded early Earth with the raw ingredients that fostered the emergence of living organisms. Asteroids have struck Earth occasionally over its long history, often with cataclysmic results. An asteroid estimated at 6-9 miles (10-15 km) wide hit off the coast of Mexico's Yucatan Peninsula 66 million years ago, eradicating about three-quarters of the world's species and ending the age of dinosaurs. NASA in 2022 carried out a proof-of-principle planetary defense mission by using its robotic DART spacecraft to change the trajectory of the asteroid Dimorphos, with an eye toward doing this in the future if one appears on a collision course with Earth. "The likelihood that a Bennu-sized asteroid will strike Earth is quite small at 0.037%. Even though small, the potential impact would be very serious and would likely lead to massive longer-term food insecurity on our planet and climate conditions that are similar to those seen only for some of the largest volcanic eruptions in the last 100,000 years," Timmermann said. "So it is important to think about the risk," Timmermann added.
Khaleej Times
06-02-2025
- Science
- Khaleej Times
Scientists predict devastation if asteroid Bennu strikes Earth in 2182
The rocky object called Bennu is classified as a near-Earth asteroid, currently making its closest approach to Earth every six years at about 299,000km away. It might come even closer in the future, with scientists estimating a one-in-2,700 chance of a collision with Earth in September 2182. So what would happen should Bennu strike our planet? Well, it would not be pretty, according to new research based on computer simulations of an impact by an asteroid with a diameter of roughly 500 metres like Bennu. Aside from the immediate devastation, it estimated that such an impact would inject 100-400 million tonnes of dust into the atmosphere, causing disruptions in climate, atmospheric chemistry and global photosynthesis lasting three to four years. "The solar dimming due to dust would cause an abrupt global 'impact winter' characterised by reduced sunlight, cold temperature and decreased precipitation at the surface," said Lan Dai, a postdoctoral research fellow at the IBS Centre for Climate Physics (ICCP) at Pusan National University in South Korea and lead author of the study published this week in the journal Science Advances. In the worst-case scenario, the researchers found that Earth's average surface temperature would decrease by about 4 degrees Celsius, average rainfall would fall by 15 per cent, there would be a reduction of up to 20-30 per cent in plant photosynthesis and a 32 per cent depletion in the planet's ozone layer that protects against harmful solar ultraviolet radiation. The impact of a Bennu-sized object — a medium-sized asteroid — on Earth's land surface would generate a powerful shockwave, earthquakes, wildfires and thermal radiation, leave a gaping crater and eject huge amounts of debris upward, the researchers said. Large quantities of aerosols and gases would reach the upper atmosphere, causing years-long effects on climate and ecosystems, according to Dai and study senior author Axel Timmermann, a climate physicist and ICCP director. The unfavourable climate conditions would inhibit plant growth on land and in the ocean, they said. "In contrast to the rapid reduction and slow two-year-long recovery of plants on land, plankton in the ocean would recover within six months — and even increase afterward with unprecedented diatom (a type of algae) blooms triggered by iron-rich dust deposition into the ocean," Dai said. Severe ozone depletion would occur in the stratosphere — the second atmospheric layer as you go upward — due to strong warming caused by the solar absorption of dust particles, the researchers said. An asteroid collision of this magnitude could cause massive loss of human life, but that calculation was outside the study's scope. Dai said the potential death toll "mainly depends on where the asteroid impact occurs". Scientists know a great deal about Bennu, considered a "rubble pile" asteroid — a loose amalgamation of rocky material rather than a solid object. It is a rocky remnant of a larger celestial body that had formed near the dawn of the solar system roughly 4.5 billion years ago. Nasa's robotic Osiris-REx spacecraft journeyed to Bennu and in 2020 collected samples of rock and dust for analysis. A study published in January showed that Bennu's samples bore some of the chemical building blocks of life, strong evidence that asteroids may have seeded early Earth with the raw ingredients that fostered the emergence of living organisms. Asteroids have struck Earth occasionally over its long history, often with cataclysmic results. An asteroid estimated at 10-15km wide hit off the coast of Mexico's Yucatan Peninsula 66 million years ago, eradicating about three-quarters of the world's species and ending the age of dinosaurs. Nasa in 2022 carried out a proof-of-principle planetary defence mission by using its robotic Dart spacecraft to change the trajectory of the asteroid Dimorphos, with an eye toward doing this in the future if one appears on a collision course with Earth. "The likelihood that a Bennu-sized asteroid will strike Earth is quite small at 0.037 per cent. Even though small, the potential impact would be very serious and would likely lead to massive longer-term food insecurity on our planet and climate conditions that are similar to those seen only for some of the largest volcanic eruptions in the last 100,000 years," Timmermann said. "So it is important to think about the risk," Timmermann added.
Asharq Al-Awsat
06-02-2025
- Science
- Asharq Al-Awsat
Scientists Predict Devastation if Asteroid Bennu Strikes Earth in 2182
The rocky object called Bennu is classified as a near-Earth asteroid, currently making its closest approach to Earth every six years at about 186,000 miles (299,000 km) away. It might come even closer in the future, with scientists estimating a one-in-2,700 chance of a collision with Earth in September 2182, Reuters reported. So what would happen should Bennu strike our planet? Well, it would not be pretty, according to new research based on computer simulations of an impact by an asteroid with a diameter of roughly three-tenths of a mile (500 meters) like Bennu. Aside from the immediate devastation, it estimated that such an impact would inject 100-400 million tons of dust into the atmosphere, causing disruptions in climate, atmospheric chemistry and global photosynthesis lasting three to four years. "The solar dimming due to dust would cause an abrupt global 'impact winter' characterized by reduced sunlight, cold temperature and decreased precipitation at the surface," said Lan Dai, a postdoctoral research fellow at the IBS Center for Climate Physics (ICCP) at Pusan National University in South Korea and lead author of the study published this week in the journal Science Advances. In the worst-case scenario, the researchers found that Earth's average surface temperature would decrease by about 7 degrees Fahrenheit (4 degrees Celsius), average rainfall would fall by 15%, there would be a reduction of up to 20-30% in plant photosynthesis and a 32% depletion in the planet's ozone layer that protects against harmful solar ultraviolet radiation. The impact of a Bennu-sized object - a medium-sized asteroid - on Earth's land surface would generate a powerful shockwave, earthquakes, wildfires and thermal radiation, leave a gaping crater and eject huge amounts of debris upward, the researchers said. Large quantities of aerosols and gases would reach the upper atmosphere, causing years-long effects on climate and ecosystems, according to Dai and study senior author Axel Timmermann, a climate physicist and ICCP director. The unfavorable climate conditions would inhibit plant growth on land and in the ocean, they said. "In contrast to the rapid reduction and slow two-year-long recovery of plants on land, plankton in the ocean would recover within six months - and even increase afterward with unprecedented diatom (a type of algae) blooms triggered by iron-rich dust deposition into the ocean," Dai said. Severe ozone depletion would occur in the stratosphere - the second atmospheric layer as you go upward - due to strong warming caused by the solar absorption of dust particles, the researchers said. An asteroid collision of this magnitude could cause massive loss of human life, but that calculation was outside the study's scope. Dai said the potential death toll "mainly depends on where the asteroid impact occurs." Scientists know a great deal about Bennu, considered a "rubble pile" asteroid - a loose amalgamation of rocky material rather than a solid object. It is a rocky remnant of a larger celestial body that had formed near the dawn of the solar system roughly 4.5 billion years ago. NASA's robotic OSIRIS-REx spacecraft journeyed to Bennu and in 2020 collected samples of rock and dust for analysis. A study published in January showed that Bennu's samples bore some of the chemical building blocks of life, strong evidence that asteroids may have seeded early Earth with the raw ingredients that fostered the emergence of living organisms. Asteroids have struck Earth occasionally over its long history, often with cataclysmic results. An asteroid estimated at 6-9 miles (10-15 km) wide hit off the coast of Mexico's Yucatan Peninsula 66 million years ago, eradicating about three-quarters of the world's species and ending the age of dinosaurs. NASA in 2022 carried out a proof-of-principle planetary defense mission by using its robotic DART spacecraft to change the trajectory of the asteroid Dimorphos, with an eye toward doing this in the future if one appears on a collision course with Earth. "The likelihood that a Bennu-sized asteroid will strike Earth is quite small at 0.037%. Even though small, the potential impact would be very serious and would likely lead to massive longer-term food insecurity on our planet and climate conditions that are similar to those seen only for some of the largest volcanic eruptions in the last 100,000 years," Timmermann said. "So it is important to think about the risk," Timmermann added.
