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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

Austrian man arrested in Croatia with deceased woman as passenger in his car

A 65-year-old Austrian citizen was arrested at a border checkpoint in Croatia after attempting to enter the country in his car with a deceased woman sitting as a passenger, police announced on Tuesday.

The man was detained in a routine check in late November in Gunja, a border area separating Bosnia from Croatia, the police told AFP. Suspicious because they saw “no consciousness or movement” from the passenger, Croatian officers called a doctor, who confirmed the death of the 83-year-old woman, also Austrian, according to her identification.

The woman’s relationship to the suspect is unknown. She had died in Bosnia, and the man intended to repatriate her body to Austria to “avoid the formalities related to transporting a corpse,” according to the police. Croatian media reported that the man was her legal guardian.

Once her death was confirmed, a funeral service took charge of the body.

 

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International

Colombian nationals arrested for human trafficking and disappearance of migrant boat

 

Colombian authorities arrested two nationals accused of the illegal trafficking of migrants to the United States and of endangering lives due to the disappearance of a boat with 40 people aboard, U.S. Department of Justice officials reported on Tuesday.

Hernando Manuel de la Cruz Rivera Orjuela, 52, and Luis Enrique Linero Pinto, 40, both Colombian citizens, were arrested on December 13 in Colombia at the request of the United States for their alleged involvement in a “transnational human trafficking operation,” the department said in a statement.

According to the charges, the detainees were transporting migrants to San Andrés Island in the Caribbean, where they would then be taken by boat to Nicaragua. The goal was to reach the United States through Central America and Mexico.

The accused are said to have advised the migrants on how to reach San Andrés Island, where they personally received them, arranged accommodations, and “took them to the boats that transported them to Nicaragua so they could enter the United States illegally,” the statement reads.

“These defendants put several migrants on the boat that disappeared off the coast of Nicaragua in 2023,” said Deputy Attorney General Nicole M. Argentieri, head of the U.S. Department of Justice’s Criminal Division, as cited in the statement.

Both men are “directly and personally responsible for the illicit trafficking of migrants on that vessel,” according to the indictment dated October 23.

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International

Homemade landmine explosion in Michoacán kills two soldiers, injures five

Two soldiers were killed and five others were injured by the explosion of homemade landmines planted by a criminal group in a mountainous area of the Mexican state of Michoacán (west), the Secretary of Defense reported on Tuesday.

The attack occurred on Monday morning in the municipality of Cotija, a border area between Michoacán and the state of Jalisco, when the military was conducting a reconnaissance mission after receiving information about an armed camp in the area, explained Secretary General Ricardo Trevilla.

“At that moment, an improvised explosive device detonated. Unfortunately, two soldiers lost their lives, and five others were injured,” the military leader detailed. The affected soldiers were airlifted to hospitals in the region by a military helicopter, while the rest of the team continued with the reconnaissance of the area.

Trevilla stated that before the explosion, the military unit had located the dismembered bodies of three people, and upon continuing the mission, they confirmed the camp was abandoned.

Asked about the individuals responsible for placing the explosives, the general suggested they could be criminals linked to the local group Cárteles Unidos, which operates in Michoacán and uses these tactics in their territorial dispute with the Jalisco New Generation Cartel, one of the most powerful criminal organizations in the country.

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