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一 |     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.
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三 | 信宜积极开展新时代文明实践志愿服务活动，精准对接村民的需求，以村民喜闻乐见的方式推进社会主义核心价值观落地生根。　　2023年以来，信宜以全市423个新时代文明实践中心（所、站）为阵地和平台，围绕党的二十大精神、乡村振兴、文明乡风等主题，深入基层开展讲师团宣讲、“‘信宜红话筒’双合宣讲汇”等活动，持续做好文明实践活动。　　此外，信宜开展选树道德模范（好人）、文明家庭、美丽庭院等系列活动，积极引导广大农民家庭以德治家、以学兴家、文明立家、忠厚传家，以家庭“小气候”温润社会“大环境”。信宜评选出“信宜好人”11名、“信宜好人”提名奖10名、文明家庭10户，其中3人获评“广东好人”，6人获评2023年“茂名好人”，3户家庭获评2023年“茂名市文明家庭”，开展事迹展播70余次。　　近年来，信宜市以深入开展文明村镇创建活动，多措并举持续引导群众破除陈规陋习，弘扬时代新风尚。乡村的“内涵美”体现在村民讲文明、树新风的悄然变化当中。“以前操办红白喜事存在攀比心理，彩礼低、不大操大办就觉得没面子。开展‘治风’工作后，大家的观念转变了，积极践行‘婚事新办、丧事简办、其他不办’的新风尚，人情来往轻松了不少。”平塘镇马安村村民张钰琼介绍，一旦有村民操办红白喜事，马安村红白理事会都会积极履职，做好事前申告、事中服务、事后评议相关工作，积极倡导群众“婚事新办、丧事简办、其他不办”，不断营造文明新风。　　编辑：麦婉华。

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