A | Washington, Oct 12 (UNI) American space agency NASA says its recent attempt to deflect the path of an asteroid was successful, after its Dart probe struck an asteroid head-on. Scientists have now confirmed the orbit of a 160m-wide space rock known as Dimorphos was altered when the Dart probe struck it head on last month. Researchers came to the conclusion after making measurements using a range of space and Earth-based telescopes. The mission was conceived to test a potential strategy to defend the Earth against threatening objects. Dart's achievement proves such an idea would work, provided it was initiated early enough and the target wasn't overly massive. "This mission shows that Nasa is trying to be ready for whatever the Universe throws at us," said agency administrator Bill Nelson. "I believe that Nasa has proven that we are serious as a defender of the planet," he told reporters. The space agency released a raft of data on Tuesday to support its assessment, including new pictures from the Hubble Space Telescope and from a small Italian spacecraft that stood off from the impact by about 50km (30 miles). The Double Asteroid Redirection Test (Dart) took place some 11 million km (7 million miles) from Earth. It saw the refrigerator-sized Nasa satellite drive straight into Dimorphos at 22,000km/h (14,000mph), destroying itself in the process. The space rock orbits a much larger (780m wide; 2,550ft) object called Didymos. Before impact, the time taken for Dimorphos to make one circuit of its sibling was 11 hours and 55 minutes. The telescope evidence now indicates this orbital period has been reduced to 11 hours and 23 minutes - a change of 32 minutes. This corresponds to Dimorphos moving closer into to Didymos by "tens of metres". Nasa had defined a minimum successful period change of Dimorphos of 73 seconds or more. The results released on Tuesday show Dart surpassed this benchmark by more than 25 times. "This is a 4 percent change in the orbital period of Dimorphos around Didymos. Dart just gave it a small nudge. But if you wanted to do this in the future, you'd want to do it years in advance," commented Nancy Chabot from the Johns Hopkins University Applied Physics Laboratory, which led the mission for Nasa. "Warning time is really key here in order to enable this sort of asteroid deflection to be used in the future as part of a much larger planetary defence strategy." Nasa's Dart programme scientist, Tom Statler, also had a word of caution about drawing too many conclusions from the experiment. Asteroids came in many different guises, he said. Their compositions and constructions were diverse - something that was being emphasised every time a mission visited a new object. "We should not be too eager to say one test on one asteroid tells us exactly how every other asteroid would behave in a similar situation," he stressed. "But what we can do is use this test as an anchor point for our physics calculations in our simulations that tell us how different kinds of impacts in different situations should behave." Four years from now, the European Space Agency (Esa) will have three spacecraft - collectively known as the Hera mission - at Didymos and Dimorphos to make follow-up studies. UNI ING。
B | 张霄说，今年是中哈建交30周年。30年来，两国关系不断迈上新台阶、取得新成果，在政治、经济、人文等各领域合作持续走深走实，惠及两国人民。习近平主席此访充分体现中方对中哈关系的高度重视，也反映出中哈永久全面战略伙伴关系的高水平。张霄说，中哈建交以来，两国关系经受住了国际风云变幻考验，在涉及彼此核心利益的问题上相互坚定支持，为促进地区和世界和平稳定作出重要贡献。近年来，在两国元首的战略引领下，两国政治互信不断加强。展望未来，中哈将继续巩固双边关系政治基础，为双方各领域合作创造良好条件。在谈到中哈“一带一路”合作时，张霄说，中哈两国山水相连，经济结构互补性强，经贸合作有着得天独厚的优势。建交以来，特别是“一带一路”倡议提出以来，两国经贸合作的深度广度不断拓展，为两国人民带来巨大福祉。张霄说，1992年，两国贸易额仅3.68亿美元，2021年达到252.5亿美元。2022年1至7月，中哈贸易额达176.7亿美元，同比增长18.9%，全年有望创下历史新高。
C | 两国建立产能和投资对话机制，成立中哈产能合作专项基金，产能合作蓬勃发展，为哈能源、工业、交通运输等领域发展提供有力支持。他说，中哈已开通7对常年对开口岸、5条油气跨境运输管道、2条跨境铁路干线和1个国际边境合作中心，连云港中哈物流合作基地、“霍尔果斯-东大门”经济特区无水港成为连接欧亚大陆两端的桥梁和哈走向大海的出口。2021年，中欧班列运送货物价值749亿美元，占中欧贸易总额的8%。2022年上半年，经新疆双口岸进出境中欧班列6195列，创造新纪录。新冠疫情背景下，中哈互联互通的快速健康发展为全球产业链、供应链的稳定作出重要贡献。“事实证明，‘一带一路’是中哈互惠互利的友谊之路、繁荣之路、成功之路。双方应进一步加强战略对接，积极探讨中方参与‘新哈萨克斯坦’建设、哈方参与中方构建‘双循环’新发展格局的具体途径。
D | ”张霄说。除经贸合作外，中哈在文化、教育、体育、科技等领域也深入合作，两国人民日益相知、相识、相近，睦邻友好的民间基础更加夯实。张霄说，目前，中国在哈开设5家孔子学院，举办“汉语桥”“汉语夏令营”“中文歌曲大赛”等活动，在哈社会掀起“中文热”。双方不断深化教育合作，拓展高校交流，广泛开展职业培训合作。两国多家媒体在对方国内落地，中国影视、书籍、游戏等在哈出版数量不断上升。两国同意推进互设文化中心，进一步提升人文合作水平。张霄说，面对新冠疫情，中哈双方相互理解、相互支持，在防疫物资、药物、疫苗等领域积极合作，谱写了抗疫合作的感人篇章。就中哈两国在多边组织中的合作，张霄表示，中哈在多边组织中一贯保持密切协作，及时就重大问题协调立场，很好地维护了双方共同利益。中哈都是上海合作组织（上合组织）创始成员国，两国始终秉持互信、互利、平等、协商、尊重多样文明、谋求共同发展的“上海精神”，在上合组织框架内保持密切沟通与协作，共同推动上合组织国家政治、经贸、互联互通、农业、人文等领域合作不断取得新发展，为促进地区安全稳定和发展繁荣作出重要贡献。（完）返回搜狐，查看更多责任编辑：
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