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
Iran issues threat to Trump as conflict escalates over Strait of Hormuz
The head of Iran’s Supreme National Security Council, Ali Larijani, threatened U.S. President Donald Trump on Tuesday, warning him to “beware of being eliminated.”
The Republican president had warned on Monday that he would strike Iran “very hard” if the Islamic Republic blocked oil shipments through the Strait of Hormuz, which has effectively been closed since the war began eleven days ago.
“Iran is not afraid of your empty threats. Others more powerful than you tried to destroy the Iranian nation and failed. Beware that you are not eliminated,” Larijani wrote on X.
Earlier, Iran’s Revolutionary Guards — the ideological military force of the Islamic Republic — also said their forces would move to block oil exports from the Gulf.
Meanwhile, Israeli Prime Minister Benjamin Netanyahu said Israel’s military offensive against Iran is far from over.
“Our aspiration is that the Iranian people free themselves from the yoke of tyranny; ultimately, that depends on them. But there is no doubt that with the measures taken so far we are breaking their bones, and we are not finished yet,” Netanyahu said in a statement.
International
Driver detained after suspicious vehicle incident near the White House
The driver was detained and no injuries were reported after an incident that occurred before dawn in Lafayette Square, just north of the White House.
The U.S. Secret Service, which is responsible for presidential security, said in a statement that it was “investigating a suspicious vehicle.” The driver of the car was taken into custody and is currently being questioned.
Washington remains under heightened security measures amid the ongoing conflict involving the United States and Israel against Iran.
Police closed several major streets around the White House. However, by about 8:30 a.m. local time (12:30 GMT), government employees and staff from nearby institutions were allowed to pass through the area with proper identification, according to an AFP journalist at the scene.
Dozens of emergency vehicles with flashing lights responded to the location, while tourists and residents waited for authorities to reopen the streets.
International
Trump Raises Possibility of “Friendly Takeover” of Cuba Amid Deepening Crisis
The President of the United States, Donald Trump, reiterated Monday the possibility that Washington could pursue a “friendly takeover” of Cuba, amid the severe crisis facing the island following the oil blockade promoted by the U.S. government.
Speaking at a press conference in Miami, the president said that U.S. Secretary of State Marco Rubio is currently “negotiating” with representatives of the Cuban government, although authorities in Havana have repeatedly denied that such talks are taking place.
Trump suggested that Washington could play a more direct role in the island’s future.
“It may be a friendly takeover. It may not be a friendly takeover. It wouldn’t matter because they’re really down to, as they say, fumes. They have no energy, they have no money. They are in deep trouble on a humanitarian basis, and we really don’t want to see that,” the U.S. president said.
The president also argued that the Cuban government had long depended heavily on support from Venezuela, particularly oil supplies.
According to Trump, that support has been drastically reduced following measures adopted by Washington.
“They were living off Venezuela. Venezuela doesn’t send them energy, fuel, oil, money, or anything anymore. They couldn’t survive without Venezuela, they couldn’t have made it, and we cut everything off,” Trump said.
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