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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)

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International

Five laboratories investigated in Spain over possible African Swine Fever leak

Catalan authorities announced this Saturday that a total of five laboratories are under investigation over a possible leak of the African swine fever virus, which is currently affecting Spain and has put Europe’s largest pork producer on alert.

“We have commissioned an audit of all facilities, of all centers within the 20-kilometer risk zone that are working with the African swine fever virus,” said Salvador Illa, president of the Catalonia regional government, during a press conference. Catalonia is the only Spanish region affected so far. “There are only a few centers, no more than five,” Illa added, one day after the first laboratory was announced as a potential source of the outbreak.

Illa also reported that the 80,000 pigs located on the 55 farms within the risk zone are healthy and “can be made available for human consumption following the established protocols.” Therefore, he said, “they may be safely marketed on the Spanish market.”

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International

María Corina Machado says Venezuela’s political transition “must take place”

Venezuelan opposition leader María Corina Machado said this Thursday, during a virtual appearance at an event hosted by the Venezuelan-American Association of the U.S. (VAAUS) in New York, that Venezuela’s political transition “must take place” and that the opposition is now “more organized than ever.”

Machado, who is set to receive the Nobel Peace Prize on December 10 in Oslo, Norway — although it is not yet known whether she will attend — stressed that the opposition is currently focused on defining “what comes next” to ensure that the transition is “orderly and effective.”

“We have legitimate leadership and a clear mandate from the people,” she said, adding that the international community supports this position.

Her remarks come amid a hardening of U.S. policy toward the government of Nicolás Maduro, with new economic sanctions and what has been described as the “full closure” of airspace over and around Venezuela — a measure aimed at airlines, pilots, and alleged traffickers — increasing pressure on Caracas and further complicating both air mobility and international commercial operations.

During her speech, Machado highlighted the resilience of the Venezuelan people, who “have suffered, but refuse to surrender,” and said the opposition is facing repression with “dignity and moral strength,” including “exiles and political prisoners who have been separated from their families and have given everything for the democratic cause.”

She also thanked U.S. President Donald Trump for recognizing that Venezuela’s transition is “a priority” and for his role as a “key figure in international pressure against the Maduro regime.”

“Is change coming? Absolutely yes,” Machado said, before concluding that “Venezuela will be free.”

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International

Catalonia’s president calls for greater ambition in defending democracy

The President of the Generalitat of Catalonia, Salvador Illa, on Thursday called for being “more ambitious” in defending democracy, which he warned is being threatened “from within” by inequality, extremism, and hate speech driven by what he described as a “politics of intimidation,” on the final day of his visit to Mexico.

“The greatest threat to democracies is born within themselves. It is inequality and the winds of extremism. Both need each other and feed off one another,” Illa said during a speech at the National Autonomous University of Mexico (UNAM) in Mexico City.

In his address, Illa stated that in the face of extremism, society can adopt “two attitudes: hope or fear,” and warned that hate-driven rhetoric seeks to weaken citizens’ resolve. “We must be aware that hate speech, the politics of intimidation, and threats in the form of tariffs, the persecution of migrants, drones flying over Europe, or even war like the invasion of Ukraine, or walls at the border, all pursue the same goal: to make citizens give up and renounce who they want to be,” he added.

Despite these challenges, he urged people “not to lose hope,” emphasizing that there is a “better alternative,” which he summarized as “dialogue, institutional cooperation, peace, and human values.”

“I sincerely believe that we must be more ambitious in our defense of democracy, and that we must remember, demonstrate, and put into practice everything we are capable of doing. Never before has humanity accumulated so much knowledge, so much capacity, and so much power to shape the future,” Illa stressed.

For that reason, he called for a daily defense of the democratic system “at all levels and by each person according to their responsibility,” warning that democracy is currently facing an “existential threat.”

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