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
Uribe requests freedom amid appeal of historic bribery conviction
Former Colombian President Álvaro Uribe on Monday requested that the Supreme Court restore his freedom while he appeals the historic 12-year house arrest sentence he received for bribery and procedural fraud.
Uribe, the most prominent figure of Colombia’s right wing, was convicted last week by a lower court for attempting to bribe paramilitary members into denying his ties to the violent anti-guerrilla squads.
Since Friday, the 73-year-old has been under house arrest at his residence in Rionegro, about 30 km from Medellín. The judge justified the measure by citing a risk of flight.
However, Uribe’s defense team rejected that argument and formally petitioned the court to immediately lift the detention order, claiming it lacks legal basis.
Uribe, a dominant force in Colombian politics for decades, is now the first former president in the country’s history to be convicted and placed under arrest, found guilty of witness tampering and obstruction of justice to prevent links to paramilitary groups.
He has repeatedly denounced the trial as politically motivated, blaming pressure from the leftist government currently in power.
His political party, Centro Democrático, has called for nationwide protests on August 7 in support of Uribe, who remains popular for his hardline stance against guerrilla groups.
Uribe has until August 13 to submit his written appeal. The case will then move to the Bogotá High Court, which has until October 16 to uphold, overturn, or dismiss the sentence. If the deadline passes without a decision, the case will be archived.
International
U.S. Embassy staff restricted as gunfire erupts near compound in Port-au-Prince
The poorest country in Latin America and the Caribbean is currently engulfed in a deep political crisis and a wave of violence driven by armed groups — a situation that an international security mission led by Kenya is attempting to stabilize.
Due to the worsening security conditions, the U.S. government has suspended all official movements of embassy personnel outside the compound in Port-au-Prince, the U.S. State Department announced Monday in a security alert posted on social media platform X.
“There are intense gunfights in the Tabarre neighborhood, near the U.S. Embassy,” the alert reads, urging the public to avoid the area.
Tabarre is a municipality located near Port-au-Prince International Airport, northeast of the Haitian capital.
According to a July report by the UN High Commissioner for Human Rights, at least 3,141 people were killed in Haitibetween January 1 and June 30 of this year.
International
Israel says 136 food aid boxes airdropped into Gaza by six nations
The Israeli military announced on Sunday that 136 boxes of food aid were airdropped into Gaza by the United Arab Emirates, Jordan, Egypt, Germany, and Belgium.
“In recent hours, six countries conducted air drops of 136 aid packages containing food for residents in the southern and northern Gaza Strip,” read the statement, which added that the operation was coordinated by COGAT, the Israeli defense body overseeing civil affairs in the occupied Palestinian territories.
The Israeli military emphasized that they will “continue working to improve the humanitarian response alongside the international community” and reiterated their stance to “refute false allegations of deliberate famine in Gaza.”
The announcement comes as UN agencies warn Gaza faces an imminent risk of famine. More than one in three residents go days without eating, and other nutrition indicators have dropped to their worst levels since the conflict began.
The agencies also noted the difficulty of “collecting reliable data in current conditions, as Gaza’s health systems —already devastated by nearly three years of conflict— are collapsing.”
Meanwhile, Gaza’s Hamas-run Health Ministry reported on Sunday that hospitals in the enclave recorded six deaths from hunger and malnutrition on Saturday, all of them adults.
Uribe requests freedom amid appeal of historic bribery conviction
U.S. Embassy staff restricted as gunfire erupts near compound in Port-au-Prince
Israel says 136 food aid boxes airdropped into Gaza by six nations
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