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
Mexico, Brazil and Colombia left out of Trump’s “Shield of the Americas” summit
Left-wing governments in Latin America, including Mexico, Brazil and Colombia, were excluded from the “Shield of the Americas” summit convened by U.S. President Donald Trump.
The meeting, held in Miami, Florida, brought together 12 presidents from across the continent to discuss strategies to combat drug cartels and organized crime.
In Mexico’s case, President Claudia Sheinbaum had recently rejected the use of military force as a solution to the drug trafficking problem. She has argued that her administration’s security strategy is producing results and emphasized that force alone is not the answer.
During the summit, Trump said that most narcotics entering the United States come through Mexico and referred to his previous conversations with Sheinbaum on the issue.
“I like the president very much, she’s a very good person,” Trump said. “But I told her: ‘Let me eradicate the cartels.’ And she said, ‘No, no, no, please, president.’ We have to eradicate them. We have to finish them.”
The remarks highlighted ongoing differences between Washington and Mexico over how to confront drug trafficking networks operating across the region.
International
Trump announces 17-nation alliance in the Americas to “destroy” drug cartels
U.S. President Donald Trump announced on Saturday the creation of a 17-nation alliance across the Americas aimed at dismantling drug cartels, during a regional summit held at his golf club in Doral.
Speaking to a group of allied leaders at the Shield of the Americas Summit, Trump said the initiative would rely on military force to eliminate powerful criminal networks operating throughout the hemisphere.
“The heart of our agreement is the commitment to use lethal military force to destroy these sinister cartels and terrorist networks. Once and for all, we will put an end to them,” Trump told the assembled heads of state.
The Republican leader argued that large portions of territory in the Western Hemisphere have fallen under the control of transnational gangs and pledged U.S. support to governments seeking to confront them. He even suggested the potential use of highly precise missiles against cartel leaders.
Before making the announcement, Trump greeted the roughly twelve leaders attending the summit, including close allies such as Javier Milei, Daniel Noboa and Nayib Bukele, whom he described as a “great president.”
The meeting forms part of Trump’s broader regional strategy inspired by his reinterpretation of the Monroe Doctrine, which seeks to reinforce Washington’s influence in the Americas, strengthen security cooperation and counter the growing presence of powers such as China.
Trump pointed to recent U.S. actions in the region as examples of his administration’s approach, including the operation that led to the capture of former Venezuelan president Nicolás Maduro earlier this year.
The summit also takes place amid escalating international tensions following the conflict launched last week by the United States and Israel against Iran.
International
Trump replaces Homeland Security Secretary Kristi Noem with Senator Markwayne Mullin
U.S. President Donald Trump announced Thursday the departure of Kristi Noem as Secretary of Homeland Security, one of the key architects of the administration’s policy of deporting undocumented immigrants.
Noem, who has been assigned a new role as a “special envoy” to Latin America, will be replaced starting March 31 by Republican Senator Markwayne Mullin, the president said in a message posted on his social media platform Truth Social.
According to media reports, Trump made the decision after Noem’s recent hearings in Congress, during which she faced tough questions regarding the awarding of a major public contract.
Mexico, Brazil and Colombia left out of Trump’s “Shield of the Americas” summit
Trump announces 17-nation alliance in the Americas to “destroy” drug cartels
Trump replaces Homeland Security Secretary Kristi Noem with Senator Markwayne Mullin
Tec de Monterrey honors one of its students for his contribution to nanotechnology in medicine
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