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
Senate Bipartisan Vote Moves Measure to Block Further U.S. Military Action in Venezuela
The U.S. Senate took a significant step on Thursday toward limiting President Donald Trump’s military authority in Venezuela, advancing a bipartisan war powers resolution that would block further military actions without explicit congressional approval, lawmakers said.
In a 52-47 procedural vote, the measure moved forward after five Republican senators joined all Democrats in supporting the effort. The resolution aims to require presidential authorization from Congress before the United States can engage in any new hostilities against Venezuela, a rare rebuke of Trump from both sides of the aisle following the controversial military operation that resulted in the capture of Venezuelan leader Nicolás Maduro.
If ultimately passed, the legislation would obligate the administration to withdraw U.S. forces from any imminent hostilities in or against Venezuela unless Congress explicitly authorizes such actions. However, the measure’s future remains uncertain as it heads next to the House of Representatives, where a Republican majority is less likely to approve it, and any final version would likely face a presidential veto. Overriding a veto would require a two-thirds majority in both chambers, a high threshold in the current political landscape.
President Trump has sharply criticized Republican senators who broke ranks to support the resolution, saying they should not be re-elected and arguing that the measure undermines his authority to act in national defense. Nevertheless, the vote signals growing bipartisan concern in Congress about unchecked executive military action in the absence of legislative authorization.
International
Petro and Trump Agree on Joint Action Against ELN Guerrillas After Tense Diplomacy
Colombian President Gustavo Petro and his U.S. counterpart Donald Trump agreed on “joint actions” to combat the National Liberation Army (ELN) guerrilla group operating along the Colombia–Venezuela border, Colombia’s Interior Minister Armando Benedetti said on Thursday.
The announcement came after a period of heightened diplomatic tension triggered by recent U.S. airstrikes in Venezuela, the capture of Venezuelan President Nicolás Maduro, and threats of possible U.S. military action in Colombia. The phone call Wednesday evening was the first direct conversation between Petro and Trump since both leaders took office, and it helped ease the strained relationship.
During the call, both presidents committed to carry out joint efforts against the ELN, a guerrilla group that has repeatedly attacked Colombian security forces and is accused of kidnapping soldiers. In December, the ELN declared a “armed strike,” confining civilians in areas under its control in response to perceived threats of U.S. intervention.
According to Benedetti, Petro welcomed Trump’s invitation to meet in Washington and asked for U.S. support to “strike hard” against ELN positions along the porous border with Venezuela, where guerrillas often flee after clashes with Colombian forces.
The border region is a longstanding flashpoint, where armed groups, drug traffickers and illegal mining networks compete for control. Previous attempts by Petro’s government to negotiate peace with the ELN have stalled after a major offensive in Catatumbo that left hundreds dead and displaced thousands.
International
Lula Vetoes Bill That Would Have Shortened Bolsonaro’s Prison Sentence
Brazilian President Luiz Inácio Lula da Silva vetoed on Thursday a bill that would have significantly reduced the prison sentence of his far-right predecessor, Jair Bolsonaro, who is currently serving time for attempting a coup d’état.
Despite the veto, the conservative-majority Congress retains the power to override the decision through a vote.
In September, following a landmark trial, Brazil’s Supreme Court sentenced Bolsonaro to 27 years in prison after finding him guilty of conspiring to remain in power in an “authoritarian” manner following his defeat to Lula in the 2022 presidential election.
The 70-year-old former president has been incarcerated in a Brasília prison since late November. Earlier this month, the Supreme Court rejected a request for house arrest on health grounds.
Under the current legal framework, Bolsonaro would be required to serve approximately eight years before becoming eligible for sentence leniency. However, a bill passed by Congress in December could have reduced that period to just over two years, prompting Lula’s veto.
Senate Bipartisan Vote Moves Measure to Block Further U.S. Military Action in Venezuela
Petro and Trump Agree on Joint Action Against ELN Guerrillas After Tense Diplomacy
Lula Vetoes Bill That Would Have Shortened Bolsonaro’s Prison Sentence
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