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Webb telescope's latest observationsTracking Asteroid 2024 YR4 again this year required some ingenuity. Many astronomers believed they wouldn't get another chance until 2028, but an international team identified two short windows last month — Feb. 18 and 26 — when Webb might still detect the space rock. The telescope observes only a small patch of sky at a time, so astronomers had to predict the asteroid's position with extreme accuracy to point the instrument correctly.
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There’s just one hitch: the system still needs guinea pigs. Even the best weather models can’t pinpoint where clear-air turbulence will occur. So the NCAR programs continue to rely on firsthand reports from planes that have already been tossed around. New technologies could change that in coming years. A plane equipped with a lidar sensor—which uses lasers to detect much finer particles than radar can—could pick up on turbulence even in a cloudless sky. But lidar systems are still too bulky and expensive to fit into a plane’s nose cone. And the government and the airline industry have been slow to invest in improving them. For now, the best hope for a flight heading into turbulence might be to program the plane itself to ride the bumps.。业内人士推荐体育直播作为进阶阅读
South Korea's benchmark Kospi index closed 12% lower, while the Nikkei 225 in Japan lost 3.6%. Hong Kong's Hang Seng index dropped 2.5%.