西安封闭冲刺正规地方(濮阳中考复读专业价格) (今日更新中)

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

Senate Majority Leader Mitch McConnell (R-Kentucky) appears to be ready to move forward with setting ground rules for an impeachment trial without the support of Democrats, according to 198

Summer might technically be over in Doha, Qatar, but if you were to visit the small, desert nation in the middle of the Persian Gulf this weekend, you would still think it is summer. Temperatures are expected to approach 100 degrees, which is relatively mild compared to the actual summertime temperatures in Qatar. In the summer, temperatures frequently top 110 degrees. Because of the year round extreme heat, and FIFA's mandate that stadiums that host the World Cup be open air, Qatar has been renovating and building stadiums that are both open air and air conditioned. A stream of cold air is funneled at ankle level under the seats. The cold air then travels down the stadium and onto the field. There are also vents at the top of the stadium. The technology relies on the physics of cool air moving downward. According to the Qatar government, the temperature in Khalifa International Stadium can drop to around 70 degrees, when it is nearly 100 degrees outside. Khalifa International Stadium opened in 2017, and was the first of eight stadiums expected to host World Cup games in 2022. A second stadium opened in May. Six more are expected to open by 2022. Next month, Khalifa International Stadium will host the Arabian Gulf Cup, which is a contest between the national teams for five countries. In December, the stadium will then host the FIFA World Cup. "Qatar's hosting of the Arabian Gulf Cup is another opportunity to test the country's event hosting expertise as we continue preparations for the FIFA Club World Cup in December and the FIFA World Cup in 2022," said Saud Al Mohannadi, vice president of the Qatar Football Association and chairman of the Arabian Gulf Cup local organizing committee.Qatar's bid to host the World Cup has not come without controversy. Following Qatar's winning bid, a multi-national investigation looked into how Qatar won the bid to host the 2022 World Cup, among other scandals tied to soccer sanctioning body FIFA. Dozens of FIFA officials were arrested in 2015, and several of whom have since been convicted for corruption. FIFA officials have been blasted by some for ignoring human rights concerns about Qatar, including its lack of a free press, lack of protection of guest workers, and its stance on homosexuality. 2282

SALEM, Ma. – To say legends never die in Salem would be an understatement. The crisp leaves and the sound of the harbor embraces you in its Americana state that you can’t help but fall in love with.And embracing that legacy, is what truly makes this town alive.“In October, it’s what we call the fifth season,” said Jill Christiansen, the assistant education director of the Salem Witch Museum.Every October, people are in Salem celebrating Halloween – every day of the month.But what is it about this place that draws us in? Why are we obsessed with the history, the secrets and the mystery?“Salem is most known today for the witch trials of 1692,” Christiansen said. “The twenty people who were executed in 1692 were innocent people. They were accused of witchcraft for any number of reasons, but they were innocent people.”People come from all over the country and the world to see the history of the witch trials. For Tina Fogel, Salem means so much more. “Is the history but it’s also my fifty ninth birthday today and it’s always been on my bucket list to come to Salem,” Fogel said while getting emotional. “We’ve had a rough couple of years. My daughter took her own life and I got the inheritance from her and that’s why I was able to come here. She would be so excited to know that I’m here.”History can be appreciated year-round, but Salem’s true colors are seen in the fall. The streets are filled with the wicked, the terrifying and just straight weird. People are wearing costumes, vendors are on the streets, hotels are almost always full, and restaurants packed.But it wasn’t always this way. Some say Salem is what it is today because of the very thing that legends say cursed it. “People kept asking me why I keep going back to Salem,” said a man who goes by the name Bubble Bob. “They say it’s a gutter. I say ‘yeah, but it’s my gutter.’ Fifteen to twenty years later, it’s a tourist entertainment spot. So, in a place where it was maybe not so healthy to get brought up is now a healthy environment. When I say it use to be a gutter, I mean a lot of people were dying from drugs and suicide. Twenty years later – nothing but improvement.”“In 1969, the show Bewitched came and filmed several episodes,” said Christiansen. “Because of that, it really put Salem back on the map again as connected to the witch trials. The tourism industry and many people attribute the town starting to grow right after that.” According to Destination Salem, from September to November about 500,000 people visit from all over the world. 9 million a year is generated through tourism alone, and thirty percent of that comes in the month of October.“We see approximatively 60,000 people in the month of October,” Christiansen said. “I believe the population of Salem at this point is 43,000. That gives you some perspective on just how many people come through here.”So why are we so drawn to this place? It’s the curiosity, the obsession, the wildly weird that allows this town to not be afraid to just be itself. And maybe, we envy that. So, to say Salem is embracing its legacy would be an understatement. 3122

Several telecommunications giants have announced that they are offering some customers free internet access in order to allow more people to work from home and stay in touch with quarantined loved ones.Comcast announced Thursday it is offering two months of 270

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