International

NASA spaceship deflected asteroid in test to save Earth

Photo: Jim Watson / AFP

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.

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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.

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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.

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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.

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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

Fire at substation triggers major blackout in San Francisco

The U.S. city of San Francisco was plunged into darkness Saturday night after a power outage left about 130,000 customers without electricity, although the utility company said service was restored to most users within hours.

Pacific Gas & Electric Company (PG&E) said in a statement posted on X that nearly 90,000 homes had their power restored by 9:00 p.m. local time (05:00 GMT on Sunday), while the remaining 40,000 customers were expected to have service restored overnight.

Large areas of the city, a major technology hub with a population of around 800,000, were affected by the blackout, which disrupted public transportation and left traffic lights out of service during the busy weekend before Christmas, a crucial period for retail businesses.

“I know it’s been a difficult day,” San Francisco Mayor Daniel Lurie said in a video posted on social media from the city’s emergency operations center. “There has been progress, but for those still without power, we want to make sure they are safe and checking in on their neighbors,” he added.

Lurie said police officers and firefighters advised residents to stay home as much as possible. He also noted that officers and traffic inspectors were deployed to manage intersections where traffic lights were not functioning.

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The mayor confirmed that the outage was caused by a fire at an electrical substation. Parts of the city were also covered in fog, further complicating conditions during the incident.

As a result of the blackout, many businesses were forced to close despite it being the weekend before Christmas. The sudden drop in shopper traffic ahead of the holiday is “devastating” for retailers, the manager of home goods store Black & Gold told the San Francisco Chronicle.

International

Cristina Kirchner recovering after appendicitis surgery in Buenos Aires

Former Argentine President Cristina Kirchner underwent surgery on Saturday after being diagnosed with appendicitis and is recovering “without complications,” according to a medical report released by the Otamendi Sanatorium.

Kirchner was admitted to the Buenos Aires medical center on Saturday after experiencing abdominal pain. Doctors performed a laparoscopic procedure that confirmed a diagnosis of “appendicitis with localized peritonitis,” the statement said, adding that her post-operative recovery has been progressing without complications.

The former president was transferred to the clinic with judicial authorization from her apartment in Buenos Aires, where she is serving a six-year sentence under house arrest for corruption.

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.