International
NASA spaceship deflected asteroid in test to save Earth
AFP / Issam Ahmed
NASA on Tuesday said it had succeeded in deflecting an asteroid in a historic test of humanity’s ability to stop an incoming cosmic object from devastating life on Earth.
The fridge-sized Double Asteroid Redirection Test (DART) impactor deliberately smashed into the moonlet asteroid Dimorphos on September 26, pushing it into a smaller, faster orbit around its big brother Didymos, said NASA chief Bill Nelson.
“DART shortened the 11 hour 55 minute orbit to 11 hours and 23 minutes,” he said. Speeding up Dimorphos’ orbital period by 32 minutes exceeded NASA’s own expectation of 10 minutes.
“We showed the world that NASA is serious as a defender of this planet,” added Nelson.
The asteroid pair loop together around our Sun every 2.1 years, and pose no threat to our planet.
But they are ideal for studying the “kinetic impact” method of planetary defense, in case an actual approaching object is ever detected.
DART’s success as a proof-of-concept has made a reality of science fiction — notably in films such as “Armageddon” and “Don’t Look Up.”
Astronomers rejoiced in stunning images of matter spreading out thousands of miles in the wake of the impact — pictures collected by Earth and space telescopes, as well as a mini satellite that had traveled to the zone with DART.
Pseudo-comet
Thanks to its temporary new tail, Dimorphos, which is 530-foot (160-meter) in diameter or roughly the size of a big Egyptian pyramid, has turned into a manmade comet.
But quantifying just how well the test worked required an analysis of light patterns from ground telescopes, which took a few weeks to become apparent.
The binary asteroid system, which was around 6.8 million miles (11 million kilometers) from Earth at impact, is visible only as a single dot from the ground.
Ahead of the test, NASA scientists said the results of the experiment would reveal whether the asteroid is a solid rock, or more like a “rubbish pile” of boulders bound by mutual gravity.
If an asteroid is more solid, the momentum imparted by a spaceship will be limited. But if it is “fluffy” and significant mass is pushed at high velocity in the opposite direction to impact, there will be an additional boost.
Never actually photographed before, Dimorphos appeared as a speck of light around an hour before impact.
Its egg-like shape and craggy, boulder-dotted surface finally came into clear view in the last few moments, as DART raced toward it at roughly 14,500 miles (23,500 kilometers) per hour.
Mass extinction
Very few of the billions of asteroids and comets in our solar system are considered potentially hazardous to our planet, and none are expected in the next hundred years or so.
But wait long enough, and it will happen.
The geological record shows, for example, that a six-mile wide asteroid struck Earth 66 million years ago, plunging the world into a long winter that led to the mass extinction of the dinosaurs along with 75 percent of all species.
An asteroid the size of Dimorphos, by contrast, would only cause a regional impact, such as devastating a city.
Kinetic impact with a spaceship is just one way to defend the planet, albeit the only method possible with current technology.
Should an approaching object be detected early, a spaceship could be sent to fly alongside it for long enough to divert its path via using the ship’s gravitational pull, creating a so-called gravity tractor.
Another option would be launching nuclear explosives to redirect or destroy an asteroid.
NASA believes the best way to deploy such weapons would be at a distance, to impart force without blowing the asteroid to smithereens, which could further imperil Earth.
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People sit at their workstations within the Mission Operations Center during the Double Asteroid Redirection Test (DART) Technology Media Workshop Telecon Briefing and tour at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, on September 12, 2022, ahead of the September 26th project test mission. - The goal of the DART mission, which launched in November 2021, is to hit an asteroid with a spacecraft to slightly alter its trajectory. (Photo by Jim WATSON / AFP)
International
Chile enters runoff campaign with Kast leading and Jara seeking a last-minute comeback
Chile’s presidential runoff campaign for the December 14 election kicked off this Sunday, with far-right candidate José Antonio Kast entering the race as the clear favorite in the polls, while left-wing contender Jeannette Jara faces an uphill scenario, hoping for a comeback that some experts describe as “a miracle.”
The final polls released in Chile—published before the mandatory blackout on survey dissemination—give Kast, an ultraconservative former lawmaker running for president for the third time, a lead of between 12 and 16 points. His opponent, the communist former minister in Gabriel Boric’s current administration, is weighed down not only by the government’s low approval ratings but also by a fragmented electorate.
Although Jeannette Jara received the most votes in the first round with 26.9%, her lack of alliances beyond the left makes it difficult for her to expand her support. Kast, who secured 23.9%, has already brought key figures on board: ultralibertarian Johannes Kaiser (13.9%) and traditional right-wing leader Evelyn Matthei (12.4%), both now backing his candidacy.
Analysts note that although Kast’s support base consolidates more than 50% of the electorate, it does not guarantee an automatic transfer of votes. Populist economist Franco Parisi, who placed third with 19.7%, emerges as the major wildcard. His party, the People’s Party (PDG), is set to decide this Sunday through an internal consultation whether to endorse one of the two finalists.
International
Trump says asylum decision freeze will remain in place “for a long time”
U.S. President Donald Trump warned on Sunday that the suspension of decisions on asylum applications—implemented as part of his order to “halt” immigration from third-world countries following Wednesday’s shooting in Washington—will remain in effect “for a long time.”
The president declined to specify how long the freeze, imposed last Friday by the U.S. Citizenship and Immigration Services (USCIS), would last. The suspension affects individuals waiting for an asylum ruling from that agency, though it does not apply to cases handled by U.S. immigration courts.
The delay is part of a series of measures enacted by the Trump Administration after a shooting on Wednesday in which an Afghan national allegedly opened fire on the National Guard in Washington, D.C., killing one officer and leaving another in critical condition.
Trump has ordered a permanent halt to immigration from 19 countries classified as “third-world.” He also indicated on Sunday that “possibly” more nations could be added to the list.
“These are countries with high crime rates. They are countries that do not function well… that are not known for success, and frankly, we don’t need people from those places coming into our country and telling us what to do,” Trump said, adding: “We don’t want those people.”
USCIS had already announced on Thursday a “rigorous review” of green cards held by migrants from 19 “countries of concern,” including Afghanistan, Cuba, Venezuela, and Haiti.
International
Sri Lanka and Indonesia deploy military as deadly asian floods kill over 1,000
Sri Lanka and Indonesia deployed military personnel on Monday to assist victims of the devastating floods that have killed more than a thousand people across Asia in recent days.
A series of weather events last week triggered prolonged torrential rains across Sri Lanka, parts of Indonesia’s Sumatra island, southern Thailand, and northern Malaysia. Indonesian President Prabowo Subianto said Monday in North Sumatra that “the priority now is to deliver the necessary aid as quickly as possible.”
“There are several isolated villages that, with God’s help, we will be able to reach,” he added. Subianto also stated that the government had deployed helicopters and aircraft to support relief operations.
Floods and landslides have claimed 502 lives in Indonesia, with a similar number still missing.
This marks the highest death toll from a natural disaster in Indonesia since 2018, when an earthquake and subsequent tsunami killed more than 2,000 people.
The government has sent three military ships carrying aid and two hospital vessels to the hardest-hit regions, where many roads remain impassable.
In the village of Sungai Nyalo, located about 100 kilometers from Padang, the capital of West Sumatra, floodwaters had receded by Sunday, leaving homes, vehicles, and crops coated in thick mud.
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