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2025-06-01 07:11:13
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  濮阳东方医院线上咨询挂号   

SpaceX completed the last big test of its crew capsule before launching astronauts in the next few months, mimicking an emergency escape shortly after liftoff Sunday.No one was aboard for the wild ride in the skies above Cape Canaveral, just two mannequins. The nine-minute flight ended with the Dragon crew capsule parachuting safely into the Atlantic, after separating and speeding away from the exploding rocket.“I’m super fired up,” Elon Musk, the company’s founder and chief executive, told reporters. “It’s just going to be wonderful to get astronauts back into orbit from American soil after almost a decade of not being able to do so. That’s just super exciting.”NASA astronauts have not launched from the U.S. since the space shuttle program ended in 2011. Musk and NASA Administrator Jim Bridenstine said the next Crew Dragon could launch with a pair of NASA astronauts in the second quarter of this year — as early as April.The Falcon 9 rocket blasted off as normal, but just over a minute into its supersonic flight, the Dragon crew capsule catapulted off the top 12 miles (20 kilometers) above the Atlantic. Powerful thrusters on the capsule propelled it up and out of harm’s way, as the rocket engines deliberately shut down and the booster tumbled out of control and exploded in a giant fireball. The capsule reached an altitude of about 27 miles (44 kilometers) before parachuting into the ocean just offshore to bring the test flight to a close. Everything appeared to go well despite the choppy seas and overcast skies. Within minutes, a recovery ship was alongside the capsule.Recycled from three previous launches, the SpaceX rocket was destroyed as it burst apart in flight and slammed in pieces into the sea. SpaceX normally tries to recover its boosters to drive down launch costs, landing them upright on a floating platform or back at the launch site.NASA’s commercial crew program manager, Kathy Lueders, said the launch abort test was “our last open milestone” before allowing SpaceX to launch Doug Hurley and Robert Behnken to the International Space Station. Their launch date will depend, in part, on whether NASA decides to keep them for months at the orbiting lab, versus just a week or two. A longer mission will require more training before flight.The astronauts monitored Sunday’s flight from the firing room. Hurley said it was “pretty neat to see” the capsule aboard the recovery ship within two hours. By all early accounts, the test was successful.“We’ll see what the data show and go from there,” Hurley said. “But it certainly is a confidence builder from the standpoint if you ever got into that situation, that Dragon can get us away from the booster quickly.”The astronauts also will have access to speed before liftoff. During a launch dress rehearsal Friday, Hurley and Behnken rode in a white Tesla Model X from Kennedy Space Center’s crew quarters to the launch pad, their sleek white and black spacesuits matching the electric sports car with wing-like doors. Musk, who also runs Tesla, used the cars to get around the space center Sunday.Delayed a day by bad weather, Sunday’s launch from Kennedy brought together hundreds of SpaceX, NASA and Air Force employees on land, at sea and in the air. Tourists and locals alike packed the adjoining visitor complex and nearby beaches to see the dramatic fiery spectacle of an out-of-control rocket. Musk brought along his own family, including his brother.NASA hired SpaceX and Boeing a decade ago to transport astronauts to and from the space station for billions of dollars. Both companies struggled with technical problems, adding years of delay and forcing NASA to shell out hundreds of millions of dollars extra for Russian rocket rides.After multiple cargo deliveries for NASA, SpaceX successfully flew an enhanced crew capsule to the space station last March without anyone on board, but it exploded a month later during ground testing. The emergency escape thrusters — the kind used in Sunday’s test — had to be retooled. In all, SpaceX has tested these powerful Super Draco thrusters some 700 times.Last month, meanwhile, Boeing’s Starliner crew capsule ended up in the wrong orbit on its first test flight and had to skip the space station. The previous month, only two of the Starliner’s three parachutes deployed during a launch abort test.Lueders said it’s too soon to know whether Boeing will need to send another Starliner to the space station without a crew or go straight to launching astronauts later this year. An investigation team is still looking into why the Starliner’s automated timer was off by 11 hours during the December test flight.The importance of launch escape was demonstrated in 2017 when two astronauts, an American and a Russian, were pulled to safety during a failed launch from Kazakhstan. They experienced up to seven times the force of gravity during the abort, but walked away from the accident.The SpaceX in-flight abort system, Musk pointed out, should be gentler for the crew and is good from the launch pad all the way to orbit.Musk said the Dragon’s escape system should work — in principle — even if the capsule is still attached when the rocket erupts in a fireball. He said that could look like “something out of ‘Star Wars’” with the capsule flying right out of a fireball.“Obviously we want to avoid doing that,” he quickly added, taking note of all the NASA personnel around him.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content. 5629

  濮阳东方医院线上咨询挂号   

RICHMOND, Va. – Thousands of gun-rights activists and other groups crowded the streets around Virginia’s Capitol to protest plans by the state's Democratic leadership to pass gun-control legislation. Citing credible threats of violence, Gov. Ralph Northam declared a temporary state of emergency days ahead of Monday’s rally, banning all weapons including guns from Capitol Square, where the event was set to be held. Virginia's highest court has upheld the ban. The Supreme Court issued its decision late Friday, rejecting an appeal from gun-rights groups that said the ban violated their Second Amendment right to bear arms.The court did not rule on the merits of the case, however. The justices said they did not have enough information to decide whether a lower court judge had ruled appropriately. The Southern Poverty Law Center says that threats of violence have been “rampant” online among anti-government and far-right groups.Militia groups and white supremacists were expected to mix with gun-rights activists, raising fears that the state could again see the type violence that exploded in Charlottesville in 2017.The protest came to a close Monday afternoon with no known incidents.WATCH VIDEO OF THE EVENT BELOW: 1237

  濮阳东方医院线上咨询挂号   

SPOKANE, Wash. – The snowfall that blanketed parts of the northwest over the weekend served as an epic backdrop for one couple’s wedding photos. Brittany and Sean Tuohy of Arizona traveled back to their home state of Washington for what they thought was going to be an outdoor, "fall-themed" wedding, but Mother Nature had other plans. The Tuohyy’ wedding photographer, Jamie Denise Fletcher of 407

  

Starbucks, the home of the latte, is expanding a program to open coffee shops in poor neighborhoods. The Seattle-based company plans to open or remodel 85 stores by 2025 in rural and urban communities across the U.S. Each store will have event space, and Starbucks will work with local United Way chapters to offer programs like youth job training. Starbucks has opened 15 community stores since it announced the project 2015, including ones in Ferguson, Missouri, and New Orleans. The company says the stores are profitable and feature the same menu and similar prices as regular Starbucks. 606

  

Renters are really struggling to save anything after paying their monthly rent costs, which are up 1.5 percent across the United States. A two-bedroom rental is averaging ,180 per month. 200

来源:资阳报

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