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濮阳东方医院男科技术可靠
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发布时间: 2025-06-02 14:04:27北京青年报社官方账号
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  濮阳东方医院男科技术可靠   

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

  濮阳东方医院男科技术可靠   

CAMPO, Calif. (KGTV) -- Cal Fire responded Saturday afternoon to a large fire burning near the border in Campo. According to the agency, the fire is raging near Forest Gate Road and Border Road.Although Southern California Air Operations tweeted around 11:45 a.m. that the fire "is now well established on the U.S. side," Cal Fire says the blaze never reached the U.S. Air Operations said it sent several aircraft to the fire, including two tankers and two helicopters, but around 1 p.m., all aircraft were released from the fire. The agency said the fire is burning in light flashy fuels with a rapid rate of spread. The blaze is estimated at 50 to 100 acres currently, Cal Fire reported. Smoke could be seen rising from the hills east of Tecate, Mexico. No other details are available at this time.Stay with 10News for the latest updates on this developing story. 873

  濮阳东方医院男科技术可靠   

California health officials are warning residents not to eat oysters from British Columbia, Canada, following a norovirus outbreak.About 100 people got sick in California after they consumed the raw oysters, health officials said."As of April 27, approximately 100 individuals have reported illness after they consumed raw British Columbian oysters sold by restaurants and retailers throughout the state," the California Department of Public Health said."Laboratory testing has confirmed norovirus infection in several patients from both California and Canada. Although the number of reported new illnesses has decreased during the last week, the investigation is ongoing."Canada has reported 172 cases of gastrointestinal illness linked to consumption of raw oysters."Avoid eating raw and undercooked shellfish, including oysters, to reduce your risk of illness," said Dr. Karen Smith, a public health officer in California."If you do eat shellfish, cook it until it reaches an internal temperature of at least 145°F. Quick steaming isn't sufficient to kill norovirus."Norovirus is spread through the ingestion of infectious virions, which grow in the small intestine before being expelled in feces. Infection usually occurs when someone eats food or drinks liquids that have been contaminated, touches surfaces or objects that are contaminated and then puts their hands in their mouth, or has contact with someone who has been infected, such as by sharing food.Norovirus causes inflammation of the stomach, the intestines or both. A person usually develops symptoms 12 to 48 hours after being exposed.Common symptoms include vomiting, diarrhea, nausea and stomach cramps.  1687

  

CARLSBAD, Calif. (KGTV) — This month, Legoland California will celebrate its 20th birthday with new entertainment, desserts, and a special deal for youngsters.On March 20, Legoland will celebrate its birthday by giving one special park-goer, who is also celebrating his or her birthday, the chance to open the park for the day. The first 1,000 kids in the park will also get free child-size minifigure hands and get to attend a birthday-themed park opening ceremony.At the center of the party will stand a Lego birthday cake consisting of more than 51,000 Lego bricks, showcasing the attractions added to the park since it opened in 1999.The festivities continue all year long, with special birthday desserts, pop badges, and more for park guests. Starting March 16 through Sept. 1, a special 20th Birthday Dance Party can be enjoyed daily, filled with music and dancing.And all year, children ages 12 and under can get into Legoland for free on their birthday. 969

  

CAPE CANAVERAL, Fla. (AP) - NASA launched another of the world's most advanced weather satellites on Thursday, this time to safeguard the western U.S.The GOES-S satellite thundered toward orbit aboard an Atlas V rocket, slicing through a hazy late afternoon sky. Dozens of meteorologists gathered for the launch, including TV crews from the Weather Channel and WeatherNation.GOES-S is the second satellite in an approximately billion effort that's already revolutionizing forecasting with astonishingly fast, crisp images of hurricanes, wildfires, floods, mudslides and other natural calamities.RELATED: NASA's James Webb Space Telescope Launch Might Be Delayed - AgainThe first spacecraft in the series, GOES-16, has been monitoring the Atlantic and East Coast for the past year for the National Oceanic and Atmospheric Administration . The same first-class service is now coming to the Pacific region.Besides the West Coast, Alaska and Hawaii, GOES-S also will keep watch over Mexico and Central America. It will become GOES-17 once it reaches its intended 22,000-mile-high orbit over the equator in a few weeks, and should be officially operational by year's end."We can't wait!" tweeted the National Weather Service in Anchorage just before the rocket soared from Cape Canaveral Air Force Station.RELATED: SpaceX Falcon 9 rocket finally launches after two liftoff delaysThe weather service's Jim Yoe said on NASA TV that he was "really excited" to see his first launch in person."I'm even more excited about the work that's coming up for me and my colleagues, putting these new data to work for better forecasts and warnings for the American public," said Yoe, an official at the Joint Center for Satellite Data Assimilation.With these two new satellites, NOAA's high-definition coverage will stretch from the Atlantic near West Africa, a hotbed for hurricane formation, all the way across the U.S. and the Pacific out to New Zealand.RELATED: Satellite lost by NASA discovered 12 years laterIt's the third weather tracker launched by NASA in just over a year: "three brilliant eyes in the sky," as NOAA satellite director Stephen Volz puts it. GOES-16 launched in late 2016 and an environmental satellite rocketed into a polar orbit from California last November.These next-generation Geostationary Operational Environmental Satellites, or GOES, are "a quantum leap above" the federal agency's previous weather sentinels, Volz said. This is the 18th launch of a GOES since 1975; one was lost in an explosion during liftoff and all but three of the satellites already up there are retired. Rockets by United Launch Alliance, a venture between Lockheed Martin and Boeing, carried all those GOES.Even as it was still being checked in orbit, GOES-16 provided invaluable data to firefighters battling blazes in Texas, Oklahoma and elsewhere last March and to Houston-area rescue teams in the flooded aftermath of Hurricane Harvey last August, according to officials. GOES-16 also observed the uncertain path of Hurricanes Irma and the rapidly intensifying Hurricane Maria in September.RELATED: SpaceX Plans To Bring High-Speed Internet To BillionsGOES-16 "turned out to be better than we expected it to be," said National Weather Service director Louis Uccellini, on hand for Thursday's launch. The satellite wasn't officially on duty yet, "and we were just standing there gawking at the imagery,"As Hurricane Harvey approached the Texas coast, the satellite revealed the clouds sinking in the eye and the eye expanding as the storm morphed from a category 2 to 4, Uccellini said. Those images helped determine when it was safe for rescue teams to go out and save stranded residents, he added.The satellite also alerted authorities in Texas and Oklahoma to the eruption of new blazes even before the 911 calls came in, Uccellini said. He said the satellite also tracked the direction of the fires like never before, prompting first responders to later tell NOAA: "You saved lives."RELATED: Report: NASA Is Planning To Privatize International Space StationTwo more are planned in this four-satellite series: GOES-T in 2020 and GOES-U in 2024. The .8 billion cost includes the development, launch and operation of all four satellites as well as ground systems through 2036. 4290

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