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
Argentina detects first local cases of Influenza A (H3N2) Subclade K
Argentina’s National Administration of Laboratories and Health Institutes (ANLIS) “Dr. Carlos G. Malbrán” has confirmed the detection of three cases of influenza A (H3N2) corresponding to subclade K in the country. These are the first locally recorded cases of this variant, which has become predominant in several countries in the Northern Hemisphere in recent months and is associated with higher transmissibility.
The cases were identified through the National Network of Laboratories and Sentinel Units and confirmed by the National Reference Laboratory of INEI-ANLIS using genomic sequencing techniques. According to health authorities, the cases involve two adolescents from the province of Santa Cruz, detected as part of the Ambulatory Monitoring Strategy for Acute Respiratory Infections, and a child who had been hospitalized in the Autonomous City of Buenos Aires.
In all three cases, patients experienced mild illness and recovered without complications. Officials did not specify whether any of the affected individuals had a recent travel history.
The jurisdictions involved have already launched the corresponding epidemiological investigations and are responsible for ensuring timely medical care for the detected cases. According to the latest integrated surveillance report, the circulation of influenza and other respiratory viruses in Argentina remains within expected levels for this time of year.
International
Pentagon confirms Trump pick for SouthCom as U.S. military pressure grows
Former U.S. President Donald Trump has nominated a Marine Corps lieutenant general to lead U.S. Southern Command (SouthCom), the Pentagon announced on Friday, as Trump said he does not rule out the possibility of a war with Venezuela.
If confirmed by the U.S. Senate, Marine Corps Lieutenant General Francis L. Donovan would replace an admiral who, according to media reports, criticized recent attacks on vessels allegedly linked to drug trafficking off the Venezuelan coast.
Washington has deployed a significant military presence in both the Caribbean and the Pacific, where it has carried out airstrikes against boats it claims were used by suspected drug traffickers. According to an AFP tally based on official information, the attacks have left more than 100 people dead.
The Venezuelan government has denounced what it describes as a plot to overthrow President Nicolás Maduro and seize the country’s oil resources.
In a statement published Friday on the Pentagon’s website, U.S. Secretary of Defense Pete Hegseth announced that Trump had nominated Lieutenant General Donovan to serve as commander of U.S. Southern Command.
SouthCom is responsible for U.S. military operations in Central and South America, as well as parts of the Caribbean.
According to the Department of Defense, Donovan currently serves as deputy commander of U.S. Special Operations Command. His appointment is subject to Senate confirmation.
International
Trump moves to reclassify marijuana as less dangerous substance
Former U.S. President Donald Trump signed an executive order on Thursday to reclassify marijuana as a less dangerous addictive substance, a move aimed at encouraging medical research without immediately opening the door to federal-level decriminalization.
Trump said that “people were begging” him to make the decision, particularly individuals suffering from chronic pain. He stressed, however, that the measure “is not at all a decriminalization” of marijuana for non-medical use.
“I’ve always told my children: don’t use drugs, don’t drink, don’t smoke,” Trump added. He is a well-known teetotaler.
A senior government official described the decision as “common sense” during a briefing with reporters, noting that marijuana and CBD-based products — a compound derived from cannabis known for its relaxing properties — are already widely used in the United States by patients dealing with chronic pain.
Most U.S. states currently allow the use of cannabis for medical purposes, and more than 20 states, along with the nation’s capital, Washington, D.C., have also legalized recreational use.
Argentina detects first local cases of Influenza A (H3N2) Subclade K
Pentagon confirms Trump pick for SouthCom as U.S. military pressure grows
Trump moves to reclassify marijuana as less dangerous substance
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