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2025-05-30 03:43:31
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  梅州流产在线咨询专家   

CAPE CANAVERAL, Fla. (AP) — Mars is about to get its first U.S. visitor in years: a three-legged, one-armed geologist to dig deep and listen for quakes.NASA's InSight makes its grand entrance through the rose-tinted Martian skies on Monday, after a six-month, 300 million-mile (480 million-kilometer) journey. It will be the first American spacecraft to land since the Curiosity rover in 2012 and the first dedicated to exploring underground.NASA is going with a tried-and-true method to get this mechanical miner to the surface of the red planet. Engine firings will slow its final descent and the spacecraft will plop down on its rigid legs, mimicking the landings of earlier successful missions.That's where old school ends on this billion U.S.-European effort .Once flight controllers in California determine the coast is clear at the landing site — fairly flat and rock free — InSight's 6-foot (1.8-meter) arm will remove the two main science experiments from the lander's deck and place them directly on the Martian surface.No spacecraft has attempted anything like that before.The firsts don't stop there.One experiment will attempt to penetrate 16 feet (5 meters) into Mars, using a self-hammering nail with heat sensors to gauge the planet's internal temperature. That would shatter the out-of-this-world depth record of 8 feet (2 ? meters) drilled by the Apollo moonwalkers nearly a half-century ago for lunar heat measurements.The astronauts also left behind instruments to measure moonquakes. InSight carries the first seismometers to monitor for marsquakes — if they exist. Yet another experiment will calculate Mars' wobble, providing clues about the planet's core.It won't be looking for signs of life, past or present. No life detectors are on board.The spacecraft is like a self-sufficient robot, said lead scientist Bruce Banerdt of NASA's Jet Propulsion Laboratory."It's got its own brain. It's got an arm that can manipulate things around. It can listen with its seismometer. It can feel things with the pressure sensors and the temperature sensors. It pulls its own power out of the sun," he said.By scoping out the insides of Mars, scientists could learn how our neighbor — and other rocky worlds, including the Earth and moon — formed and transformed over billions of years. Mars is much less geologically active than Earth, and so its interior is closer to being in its original state — a tantalizing time capsule.InSight stands to "revolutionize the way we think about the inside of the planet," said NASA's science mission chief, Thomas Zurbuchen.But first, the 800-pound (360-kilogram) vehicle needs to get safely to the Martian surface. This time, there won't be a ball bouncing down with the spacecraft tucked inside, like there were for the Spirit and Opportunity rovers in 2004. And there won't be a sky crane to lower the lander like there was for the six-wheeled Curiosity during its dramatic "seven minutes of terror.""That was crazy," acknowledged InSight's project manager, Tom Hoffman. But he noted, "Any time you're trying to land on Mars, it's crazy, frankly. I don't think there's a sane way to do it."No matter how it's done, getting to Mars and landing there is hard — and unforgiving.Earth's success rate at Mars is a mere 40 percent. That includes planetary flybys dating back to the early 1960s, as well as orbiters and landers.While it's had its share of flops, the U.S. has by far the best track record. No one else has managed to land and operate a spacecraft on Mars. Two years ago, a European lander came in so fast, its descent system askew, that it carved out a crater on impact.This time, NASA is borrowing a page from the 1976 twin Vikings and the 2008 Phoenix, which also were stationary and three-legged."But you never know what Mars is going to do," Hoffman said. "Just because we've done it before doesn't mean we're not nervous and excited about doing it again."Wind gusts could send the spacecraft into a dangerous tumble during descent, or the parachute could get tangled. A dust storm like the one that enveloped Mars this past summer could hamper InSight's ability to generate solar power. A leg could buckle. The arm could jam.The tensest time for flight controllers in Pasadena, California: the six minutes from the time the spacecraft hits Mars' atmosphere and touchdown. They'll have jars of peanuts on hand — a good-luck tradition dating back to 1964's successful Ranger 7 moon mission.InSight will enter Mars' atmosphere at a supersonic 12,300 mph (19,800 kph), relying on its white nylon parachute and a series of engine firings to slow down enough for a soft upright landing on Mars' Elysium Planitia, a sizable equatorial plain.Hoffman hopes it's "like a Walmart parking lot in Kansas."The flatter the better so the lander doesn't tip over, ending the mission, and so the robotic arm can set the science instruments down.InSight — short for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport — will rest close to the ground, its top deck barely a yard, or meter, above the surface. Once its twin circular solar panels open, the lander will occupy the space of a large car.If NASA gets lucky, a pair of briefcase-size satellites trailing InSight since their joint May liftoff could provide near-live updates during the lander's descent. There's an eight-minute lag in communications between Earth and Mars.The experimental CubeSats, dubbed WALL-E and EVE from the 2008 animated movie, will zoom past Mars and remain in perpetual orbit around the sun, their technology demonstration complete.If WALL-E and EVE are mute, landing news will come from NASA orbiters at Mars, just not as quickly.The first pictures of the landing site should start flowing shortly after touchdown. It will be at least 10 weeks before the science instruments are deployed. Add another several weeks for the heat probe to bury into Mars.The mission is designed to last one full Martian year, the equivalent of two Earth years.With landing day so close to Thanksgiving, many of the flight controllers will be eating turkey at their desks on the holiday.Hoffman expects his team will wait until Monday to give full and proper thanks.___The Associated Press Health & Science Department receives support from the Howard Hughes Medical Institute's Department of Science Education. The AP is solely responsible for all content. 6433

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CATALINA, Calif. (KGTV) - Teeth marks from a great white shark are proof of a San Diego kayaker's narrow brush with danger off the coast of Catalina Island. The incident happened as Danny McDaniel and Jon Chambers were kayaking Saturday morning near Ship Rock, about two miles east of Catalina. The excursion was part of a scuba diving trip coordinated by Power Scuba from the island's Boy Scouts camp."Felt push to the left, looked to right, giant great white shark a foot from my boot," said McDaniel. "His upper half of body was out of the water, his dorsal fin was out of the water."Chambers was the first to notice the 19-foot shark before McDaniel turned around."Look at it and said, 'oh crap, oh crap, oh crap'," said Chambers. "I yelled at him to hit it."The shark had its jaws clamped on the back of the nine-foot-long kayak, inches from McDaniel. "Saw a giant, triangular, conical-shaped head right there and a huge body. Just a massive body," said McDaniel.Both men said they were frozen in fear as the great white shark hung on to the kayak for four or five seconds. Eventually, the shark let go, leaving behind puncture wounds and two large teeth in the kayak. "I don't think he took a full chomp. I think he just took a nibble and pushed," said McDaniel.The kayakers kept their paddles out of the water and did not move for several moments lest the shark return. McDaniel was "literally frozen" during that time.Despite the close encounter, McDaniel and Chambers continued with their plan to scuba dive later Saturday evening."Won't keep me out of the water, won't scare me out of the water," McDaniel said of the encounter.McDaniel offered to buy the kayak from the Boy Scout camp, which turned down his offer, according to Power Scuba owner Bill Powers."I think I've had my fill of great white sharks; I'm good. But I'm fortunate to have this experience," said McDaniel."It's one for the books. Not something you want to replicate," said Chambers. "He had the best shark attack experience without it being a bad story." 2043

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CAMPO (CNS) - Investigators sought Friday to determine what caused a solo car crash that killed an 84-year-old motorist on a rural road east of Lake Morena.The Boulevard man was headed south on a curving stretch of Buckman Springs Road in the Campo area when his 2000 Toyota Camry veered off the east side of the roadway near Oak Drive about 8:40 p.m. Thursday, according to the California Highway Patrol.The vehicle hit a tree and overturned, ejecting the driver through the front passenger-side window, CHP public-affairs Officer Travis Garrow said.The motorist, whose name was withheld pending family notification, died at the scene.Intoxication was not believed to have been a factor in the crash, Garrow said. 722

  

California just gave museums, galleries, zoos and aquariums the go-ahead to reopen, but the way they operate won't be the same. There are a lot of new rules across the nation and new changes that will affect your entertainment experiences as everyone adjusts to a new normal amid the pandemic.Executive Director Jason Jacobs can't wait to let people back in to the Sacramento, California Zoo. They'll be greeted by alligators, like little Ronnie, a 9-month-old American gator.“He made his way to California during the pandemic as we had scheduled an alligator habitat to open in April of 2020,” said Jacobs.The alligators were on their way from Florida when things shutdown. Since then, veterinarians and scientists from the University of California at Davis have worked with zoo staff. They were ready for the pandemic. As people started the lockdown, officials at the zoo were ordering extra food and supplies for their animals.“We have to have emergency management plans,” said Jacobs. “I’ve worked at zoos threatened by hurricanes, by earthquakes, by wildfires, you just have to be prepared and that’s part of operating a zoo.”And they also knew what they'd need to do to safely reopen.“Shutting down the reptile house, shutting down the playground which kids love, but it’s a high contact area, not having animal education demonstrations,” said Jacobs.The guidelines from California officials are specific. There's a long list of stipulations, things like limited capacity, disinfecting, no large events, no big in person fundraisers. The Sacramento Zoo got creative with some of those new rules.“Things like – stay within your own flock, because our flamingoes flock together, so if you come as a family, stay together,” said Jacobs. “We have other reminders that say to stay an alligators length away, not like little Ronnie alligator, but the big ones that are over 6 feet long.”They've hired more cleaning crews and strongly encourage face coverings. Those masks are a sticking point for the Memphis Zoo, which reopened about a month ago.Chief Marketing Officer Nick Harmeier says, “The biggest pushback on the new policies was the facial covering. People are either for it or completely against it. They didn’t seem like anyone was really in the middle there.”Harmeier says they wanted as many precautions as possible and didn't want to take any risks with their animals either, as there are so many unknowns about COVID-19. They've employed one-way traffic, pulled their gift facilities outside and like everywhere else, they have extremely limited capacity.“That was a big a hah for us,” said Harmeier. “We were like people have been in their houses for three months, we’re going to be slammed but that wasn’t the case and we’re still seeing that today numbers aren’t anywhere close to where they were last year and previous years.”Financially, all zoos and nonprofits have taken a hit. For Memphis, this is fundraising season. And while they're slowly opening back up, the money isn't where it needs to be.“This zoo has been through a lot of hard times – Great Depression, Spanish flu – there’s a lot of things this zoo has withstood. We feel good we’re going to push through it all."And other zoos, like Sacramento, have that same energy, reopening with a strong sense of community and survivability for the animal species they love so much. 3363

  

Celine Dion has canceled performances at The Colosseum at Caesars Palace March 27 through April 18. According to Dion's Facebook page, she has a condition in her middle ear known as Patulous Eustachian tube, which causes hearing irregularities, and makes it "extremely difficult" to sing.Dion has been experiencing this condition for the past 12-18 months, but it has been successfully treated with various ear drop medications. During the past couple of weeks these medications have no longer been working to treat the condition, so she will undergo a minimally invasive surgical procedure to correct the problem.Dion is expected to resume performances at The Colosseum as scheduled on Tuesday, May 22."Céline, Caesars Palace, and AEG Presents apologize for any inconvenience this causes ticket holders," according to a statement.Ticket holders for the canceled performances should be aware of the following: 922

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