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
Kristi Noem credits Trump for mass migrant deportations by mexican president
U.S. Secretary of Homeland Security Kristi Noem claimed that Mexican President Claudia Sheinbaum has deported “more than half a million” migrants due to pressure from former President Donald Trump.
During a cabinet meeting highlighting the “achievements” of Trump’s administration in its first 100 days, Noem asserted that under the Republican leader’s influence, “Mexico has finally come to the table” to negotiate on migration and fentanyl trafficking.
“The president of Mexico told me she has returned just over half a million people before they reached our border,” Noem stated, criticizing media reports that suggest the Biden administration deported more migrants than Trump’s.
“I wish those deportations were counted,” Noem added, “because those people never made it to our border—she sent them back because you made her.” She went on to thank Trump: “They never made it here because they got the message—because you were so aggressive.”
Noem has made controversial claims about Sheinbaum in the past, prompting the Mexican leader to refute them.
On April 1, Sheinbaum responded to one such statement by declaring, “The president answers to only one authority, and that is the people of Mexico,” after Noem said on Fox News that she gave Sheinbaum “a list of things Trump would like to see” and that Mexico’s actions would determine whether Trump granted tariff relief.
International
Vatican releases special “Sede Vacante” stamps ahead of papal transition
he Vatican’s post offices and select collector shops began selling special edition stamps this week to mark the period between the death of Pope Francis and the election of his successor.
Known as “Sede Vacante” stamps, they feature an image used on official Vatican documents during the interregnum between popes — two crossed keys without the papal tiara. These stamps went on sale Monday and will remain valid for postal use only until the new pontiff appears at the window overlooking St. Peter’s Square.
Until then, they can be used to send letters, postcards, and parcels. “Once the new pope is elected, the stamps lose their postal validity, but their collectible value rises,” said Francesco Santarossa, who runs a collectors’ shop across from St. Peter’s Square.
The Vatican has issued the stamps in four denominations: €1.25, €1.30, €2.45, and €3.20. Each is inscribed with “Città del Vaticano” and “Sede Vacante MMXXV” — Latin for “Vacant See 2025.”
International
Conclave to choose pope Francis’ successor could begin in early may
The conclave, which in the coming weeks must choose the successor to Pope Francis, will strictly follow a precise protocol refined over centuries.
The 135 cardinal electors, all under the age of 80, will cast their votes four times a day — except on the first day — until one candidate secures a two-thirds majority. The result will be announced to the world through the burning of the ballots with a chemical that produces the eagerly awaited white smoke, accompanied by the traditional cry of “Habemus Papam.”
The start date for the conclave could be announced today, as the cardinals are set to hold their fifth meeting since the pope’s passing. Luxembourg Cardinal Jean-Claude Hollerich suggested it could begin on May 5 or 6, following the traditional nine days of mourning. According to German Cardinal Reinhard Marx, the conclave could last only “a few days.”
Although the late Argentine pontiff appointed the majority of the cardinal electors, this does not necessarily ensure the selection of a like-minded successor. Francis’ leadership style differed significantly from that of his predecessor, Benedict XVI, a German theologian who was less fond of large public gatherings. It also marked a contrast with the popular Polish pope, John Paul II.
The Argentine Jesuit’s reformist papacy drew strong criticism from more conservative sectors of the Church, who are hoping for a doctrinally focused shift. His tenure was marked by efforts to combat clerical sexual abuse, elevate the role of women and laypeople, and advocate for the poor and migrants, among other causes.
Kristi Noem credits Trump for mass migrant deportations by mexican president
Vatican releases special “Sede Vacante” stamps ahead of papal transition
Conclave to choose pope Francis’ successor could begin in early may
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