NASA's Europa Clipper spacecraft will scour Jupiter moon for the ingredients for life

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NASA's Europa Clipper spacecraft will scour Jupiter moon for the ingredients for life

2024-10-15 00:23 Last Updated At：00:30

CAPE CANAVERAL, Fla. (AP) — A NASA spacecraft has set sail for Jupiter and its moon Europa, one of the best bets for finding life beyond Earth.

Europa Clipper will peer beneath the moon’s icy crust where an ocean is thought to be sloshing fairly close to the surface. It won’t search for life, but rather determine whether conditions there could support it. Another mission would be needed to flush out any microorganisms lurking there.

“It’s a chance for us to explore not a world that might have been habitable billions of years ago, but a world that might be habitable today — right now,” said program scientist Curt Niebur.

Its massive solar panels make Clipper the biggest craft built by NASA to investigate another planet. It will take 5 1/2 years to reach Jupiter and will sneak within 16 miles (25 kilometers) of Europa's surface — considerably closer than any other spacecraft.

Clipper lifted off Monday aboard SpaceX’s Falcon Heavy rocket from NASA’s Kennedy Space Center. Mission cost: $5.2 billion.

One of Jupiter’s 95 known moons, Europa is almost the size of our own moon. It's encased in an ice sheet estimated to be 10 miles to 15 miles or more (15 kilometers to 24 kilometers) thick. Scientists believe this frozen crust hides an ocean that could be 80 miles (120 kilometers) or more deep. The Hubble Space Telescope has spotted what appear to be geysers erupting from the surface. Discovered by Galileo in 1610, Europa is one of the four so-called Galilean moons of Jupiter, along with Ganymede, Io and Callisto.

What type of life might Europa harbor? Besides water, organic compounds are needed for life as we know it, plus an energy source. In Europa’s case that could be thermal vents on the ocean floor. Deputy project scientist Bonnie Buratti imagines any life would be primitive like the bacterial life that originated in Earth’s deep ocean vents. “We will not know from this mission because we can’t see that deep,” she said. Unlike missions to Mars where habitability is one of many questions, Clipper’s sole job is to establish whether the moon could support life in its ocean or possibly in any pockets of water in the ice.

When its solar wings and antennas are unfurled, Clipper is about the size of a basketball court — more than 100 feet (30 meters) end to end — and weighs nearly 13,000 pounds (6,000 kilograms). The supersized solar panels are needed because of Jupiter’s distance from the sun. The main body — about the size of a camper — is packed with nine science instruments, including radar that will penetrate the ice, cameras that will map virtually the entire moon and tools to tease out the contents of Europa’s surface and tenuous atmosphere. The name hearkens to the swift sailing ships of centuries past.

The roundabout trip to Jupiter will span 1.8 billion miles (3 billion kilometers). For extra oomph, the spacecraft will swing past Mars early next year and then Earth in late 2026. It arrives at Jupiter in 2030 and begins science work the next year. While orbiting Jupiter, it will cross paths with Europa 49 times. The mission ends in 2034 with a planned crash into Ganymede — Jupiter’s biggest moon and the solar system's too.

There’s more radiation around Jupiter than anywhere else in our solar system, besides the sun. Europa passes through Jupiter’s bands of radiation as it orbits the gas giant, making it especially menacing for spacecraft. That’s why Clipper’s electronics are inside a vault with dense aluminum and zinc walls. All this radiation would nix any life on Europa’s surface. But it could break down water molecules and, perhaps, release oxygen all the way down into the ocean that could possibly fuel sea life.

Earlier this year, NASA was in a panic that the spacecraft's many transistors might not withstand the intense radiation. But after months of analysis, engineers concluded the mission could proceed as planned.

NASA’s twin Pioneer spacecraft and then two Voyagers swept past Jupiter in the 1970s. The Voyagers provided the first detailed photos of Europa but from quite a distance. NASA’s Galileo spacecraft had repeated flybys of the moon during the 1990s, passing as close as 124 miles (200 kilometers). Still in action around Jupiter, NASA’s Juno spacecraft has added to Europa’s photo album. Arriving at Jupiter a year after Clipper will be the European Space Agency’s Juice spacecraft, launched last year.

Like Europa, Jupiter’s jumbo moon Ganymede is thought to host an underground ocean. But its frozen shell is much thicker — possibly 100 miles (160 kilometers) thick — making it tougher to probe the environment below. Callisto’s ice sheet may be even thicker, possibly hiding an ocean. Saturn’s moon Enceladus has geysers shooting up, but it’s much farther than Jupiter. Ditto for Saturn’s moon Titan, also suspected of having a subterranean sea. While no ocean worlds have been confirmed beyond our solar system, scientists believe they’re out there — and may even be relatively common.

Like many robotic explorers before it, Clipper bears messages from Earth. Attached to the electronics vault is a triangular metal plate. On one side is a design labeled “water words” with representations of the word for water in 104 languages. On the opposite side: a poem about the moon by U.S. poet laureate Ada Limon and a silicon chip containing the names of 2.6 million people who signed up to vicariously ride along.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

Death toll in attack on Christmas market in Germany rises to 5 and more than 200 injured

2024-12-21 20:17 Last Updated At：20:21

MAGDEBURG, Germany (AP) — Germans on Saturday mourned both the victims and their shaken sense of security after a Saudi doctor intentionally drove into a Christmas market teeming with holiday shoppers, killing at least five people, including a small child, and wounding at least 200 others.

Authorities arrested a 50-year-old man at the site of the attack in Magdeburg on Friday evening and took him into custody for questioning. He has lived in Germany since 2006, practicing medicine in Bernburg, about 40 kilometers (25 miles) south of Magdeburg. officials said.

The state governor, Reiner Haseloff, told reporters that the death toll rose to five from a previous figure of two and that more than 200 people in total were injured.

Chancellor Olaf Scholz said that nearly 40 of them "are so seriously injured that we must be very worried about them.”

Several German media outlets identified the suspect as Taleb A., withholding his last name in line with privacy laws, and reported that he was a specialist in psychiatry and psychotherapy.

Mourners lit candles and placed flowers outside a church near the market on the cold and gloomy day. Several people stopped and cried. A Berlin church choir whose members witnessed a previous Christmas market attack in 2016 sang Amazing Grace, a hymn about God's mercy, offering their prayers and solidarity with the victims.

There were still no answers Saturday as to what motivated the man to drive his black BMW into a crowd in the eastern German city.

Describing himself as a former Muslim, the suspect shared dozens of tweets and retweets daily focusing on anti-Islam themes, criticizing the religion and congratulating Muslims who left the faith.

He also accused German authorities of failing to do enough to combat what he said was the “Islamism of Europe.” Some described him as an activist who helped Saudi women flee their homeland. He has also voiced support for the far-right and anti-immigrant Alternative for Germany (AfD) party.

Haseloff said Friday that authorities believed the man acted alone.

The violence shocked Germany and the city, bringing its mayor to the verge of tears and marring a festive event that’s part of a centuries-old German tradition. It prompted several other German towns to cancel their weekend Christmas markets as a precaution and out of solidarity with Magdeburg’s loss. Berlin kept its markets open but has increased its police presence at them.

Germany has suffered a string of extremist attacks in recent years, including a knife attack that killed three people and wounded eight at a festival in the western city of Solingen in August.

Magdeburg is a city of about 240,000 people, west of Berlin, that serves as Saxony-Anhalt’s capital. Friday’s attack came eight years after an Islamic extremist drove a truck into a crowded Christmas market in Berlin, killing 13 people and injuring many others. The attacker was killed days later in a shootout in Italy.

Chancellor Scholz and Interior Minister Nancy Faeser traveled to Magdeburg on Saturday, and a memorial service is to take place in the city cathedral in the evening. Faeser ordered flags lowered to half-staff at federal buildings across the country.

Verified bystander footage distributed by the German news agency dpa showed the suspect’s arrest at a tram stop in the middle of the road. A nearby police officer pointing a handgun at the man shouted at him as he lay prone, his head arched up slightly. Other officers swarmed around the suspect and took him into custody.

Thi Linh Chi Nguyen, a 34-year-old manicurist from Vietnam whose salon is located in a mall across from the Christmas market, was on the phone during a break when she heard loud bangs and thought at first they were fireworks. She then saw a car drive through the market at high speed. People screamed and a child was thrown into the air by the car.

Shaking as she described the horror of what she witnessed, she recalled seeing the car bursting out of the market and turning right onto Ernst-Reuter-Allee street and then coming to a standstill at the tram stop where the suspect was arrested.

The number of injured people was overwhelming.

“My husband and I helped them for two hours. He ran back home and grabbed as many blankets as he could find because they didn’t have enough to cover the injured people. And it was so cold," she said.

The market itself was still cordoned off Saturday with red-and-white tape and police vans every 50 meters (yards). Police with machine pistols guarded every entry to the market. Some thermal security blankets still lay on the street.

Christmas markets are a German holiday tradition cherished since the Middle Ages, now successfully exported to much of the Western world.

Aboubakr reported from Cairo and Gera from Warsaw, Poland. Geir Moulson contributed from Berlin.