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发布时间: 2025-05-24 23:29:04北京青年报社官方账号
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CAPE CANAVERAL, Fla. (AP) — The spacecraft team that brought us close-ups of Pluto will ring in the new year by exploring an even more distant and mysterious world.NASA's New Horizons spacecraft will zip past the scrawny, icy object nicknamed Ultima Thule (TOO-lee) soon after the stroke of midnight.One billion miles beyond Pluto and an astounding 4 billion miles from Earth (1.6 billion kilometers and 6.4 billion kilometers), Ultima Thule will be the farthest world ever explored by humankind. That's what makes this deep-freeze target so enticing; it's a preserved relic dating all the way back to our solar system's origin 4.5 billion years ago. No spacecraft has visited anything so primitive."What could be more exciting than that?" said project scientist Hal Weaver of Johns Hopkins University, part of the New Horizons team.Lead scientist Alan Stern of Southwest Research Institute in Boulder, Colorado, expects the New Year's encounter to be riskier and more difficult than the rendezvous with Pluto: The spacecraft is older, the target is smaller, the flyby is closer and the distance from us is greater.NEW HORIZONSNASA launched the spacecraft in 2006; it's about the size of a baby grand piano. It flew past Pluto in 2015, providing the first close-up views of the dwarf planet. With the wildly successful flyby behind them, mission planners won an extension from NASA and set their sights on a destination deep inside the Kuiper Belt. As distant as it is, Pluto is barely in the Kuiper Belt, the so-called Twilight Zone stretching beyond Neptune. Ultima Thule is in the Twilight Zone's heart.ULTIMA THULEThis Kuiper Belt object was discovered by the Hubble Space Telescope in 2014. Officially known as 2014 MU69, it got the nickname Ultima Thule in an online vote. In classic and medieval literature, Thule was the most distant, northernmost place beyond the known world. When New Horizons first glimpsed the rocky iceball in August it was just a dot. Good close-up pictures should be available the day after the flyby.ARE WE THERE YET?New Horizons will make its closest approach in the wee hours of Jan. 1 — 12:33 a.m. EST. The spacecraft will zoom within 2,200 miles (3,500 kilometers) of Ultima Thule, its seven science instruments going full blast. The coast should be clear: Scientists have yet to find any rings or moons around it that could batter the spacecraft. New Horizons hurtles through space at 31,500 mph (50,700 kph), and even something as minuscule as a grain of rice could demolish it. "There's some danger and some suspense," Stern said at a fall meeting of astronomers. It will take about 10 hours to get confirmation that the spacecraft completed — and survived — the encounter.POSSIBLY TWINSScientists speculate Ultima Thule could be two objects closely orbiting one another. If a solo act, it's likely 20 miles (32 kilometers) long at most. Envision a baked potato. "Cucumber, whatever. Pick your favorite vegetable," said astronomer Carey Lisse of Johns Hopkins. It could even be two bodies connected by a neck. If twins, each could be 9 miles to 12 miles (15 kilometers to 20 kilometers) in diameter.MAPPING MISSONScientists will map Ultima Thule every possible way. They anticipate impact craters, possibly also pits and sinkholes, but its surface also could prove to be smooth. As for color, Ultima Thule should be darker than coal, burned by eons of cosmic rays, with a reddish hue. Nothing is certain, though, including its orbit, so big that it takes almost 300 of our Earth years to circle the sun. Scientists say they know just enough about the orbit to intercept it.COMPARING FLYBYSNew Horizons will get considerably closer to Ultima Thule than it did to Pluto: 2,220 miles versus 7,770 miles (3,500 kilometers vs. 12,500 kilometers). At the same time, Ultima Thule is 100 times smaller than Pluto and therefore harder to track, making everything more challenging. It took 4 ? hours, each way, for flight controllers at Johns Hopkins' Applied Physics Lab in Laurel, Maryland, to get a message to or from New Horizons at Pluto. Compare that with more than six hours at Ultima Thule.WHAT'S NEXTIt will take almost two years for New Horizons to beam back all its data on Ultima Thule. A flyby of an even more distant world could be in the offing in the 2020s, if NASA approves another mission extension and the spacecraft remains healthy. At the very least, the nuclear-powered New Horizons will continue to observe objects from afar, as it pushes deeper into the Kuiper Belt. There are countless objects out there, waiting to be explored. 4591

  宜宾整个鼻子多少钱啊   

CHICAGO (AP) — Authorities say a Chicago man has been charged with murder after a fatal fight that began when he put his hands in Thanksgiving leftovers.James Dixon is charged with killing Vincell Jackson, who was the boyfriend of the Thanksgiving party host.A prosecutor says Jackson was trying to escort Dixon out of the Chicago house because he put his hands in leftovers around 3 a.m. Friday.The fight moved to the porch, where law enforcement says Jackson was stabbed at least nine times.Defense attorney Patrick Ryan says Dixon was properly defending himself.A judge set bond at 0,000. 602

  宜宾整个鼻子多少钱啊   

Catastrophic wildfires continue to ravage California, as one blaze nearly doubled in size over the last three days, making it the largest in the state's history.No one has been injured in the Mendocino Complex Fire, which consists of two fires -- the Ranch Fire and the River Fire -- burning around Clear Lake, in several counties in Northern California.Combined, they form the biggest blaze that California firefighters are currently battling. Altogether, the Mendocino Complex Fire has burned 283,800 acres -- growing about 80% since Friday night. As of Monday evening, it was 30% contained and had destroyed 75 residences.The Mendocino Complex Fire has now surpassed last year's Thomas Fire, which burned 281,893 acres in Ventura and Santa Barbara counties, as the largest fire in Cal Fire history. 819

  

Caitlyn Jenner says she made a "mistake" in thinking she could work with President Donald Trump to benefit the LGBQT community and is now no longer a Trump supporter.In a Washington Post op-ed published Thursday, Jenner said at first she believed she could work with Trump and Republicans to change the party's stance on LGBQT issues."Sadly, I was wrong," Jenner wrote, adding, "The reality is that the trans community is being relentlessly attacked by this president."She argued that Trump "has shown no regard for an already marginalized and struggling community.""Believing that I could work with Trump and his administration to support our community was a mistake," Jenner wrote.She pointed to a New York Times report that the Department of Health and Human Services has a draft proposal to define gender under Title IX as solely male or female at birth, with no room for change.Jenner said her hope in Trump and Republicans was "misplaced" and that she "cannot support anyone who is working against our community.""I do not support Trump," she wrote. "I must learn from my mistakes and move forward."Over three years ago, the famed US Olympian came out as transgender in an interview with ABC's Diane Sawyer. Jenner voted for Trump in the 2016 presidential election and told E! in an interview Trump "would be very good for women's issues."However, Jenner began criticizing the President after the Trump administration announced a ban on transgender people serving in the military and withdrew Obama era guidance for transgender students in public schools that let them use bathrooms and facilities corresponding with their gender identity.The-CNN-Wire 1665

  

CARLSBAD (KGTV) - Among the businesses saying Trump's trade war is hurting is San Diego born JLab, a booming audio company competing with huge brands.The Silicon Valley-style company in Carlsbad is buzzing as you walk through the large modern rectangular door."This company was four people four years ago, but now we're 40." CEO Win Cramer said they have lived the American Dream, saying they're a scrappy business always fighting to get on top."We worked out of literally, a house, or a rundown office or an apartment building forever," he said. JLab competes against major brands like Bose and Beats.They found a niche and made a name for themselves, "We came out with some fun colorful designs that happened to be on trend."Cramer said innovation is their secret weapon."It gives you the option to really tune out on a plane, you push a button and the engine noise goes away," explaining one of their earbuds.Their newest challenge is Trump's trade war. Billions of dollars in tariffs imposed on China are going into effect, and while all of the design work is done in Carlsbad, 100% of JLab's product is shipped from China.Cramer was sitting on a plane when he saw the alert, "this news pops up on my phone that 0 billion in tariffs announced, I quickly perused the list and saw our tariff code that we import  80% of our products was on the list and I just had this feeling of oh gosh we're going to have to fight this battle that we don't know how to fight."He is bending every ear within reach to spread awareness of how this affects JLab and other American businesses and even went to Washington DC to plead his case.Cramer said no legislators were there, just staffers and no electronic devices were allowed into the room. He said there is a written record of what was said."It was the largest hearing in US history which in it of itself should tell you something and how folks are, at least businesses like us are taking this pretty serious," he said.Production costs could increase by 25% and with the holiday season upon us, he's running out of options, "layoffs or pay cuts being the last option, certainly not something that I want to do or think about or consider, but it's something we're being forced to consider."He hopes change is swift and those in power hear his plea.He said the company will find out in mid-September how big the changes will be, and will see impacts as early as October. Cramer added a lot of the burden will fall on the customer, as they will have to raise the products' price.JLab employs 30 people in San Diego. 2630

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