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'NASA ready to take whatever Universe throws at us'_我的网站

一 |     转自公众号：新西兰中文先驱Chinese_Herald          OMG!          Advertise with us          新西兰超市的鼠患          从南岛蔓延到北岛          继Countdown被曝光后          奥克兰的Pak'nSave也发现          昨天，我们报道了中国游客在基督城Eastgate Countdown发现老鼠在熟食区乱窜的新闻后，引发关注。    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。         不料，今天，奥克兰一名女子又爆料，她在奥克兰西区Lincoln Rd的Pak'nSave超市拍到老鼠。         这位住在西区Ranui的女子说，她每周都会去Lincoln Rd超市采购一次，这是她在当地买杂货常去的地方。         女子说，今天下午1点左右，她在超市过道里竟然也看到一只老鼠，令她感到很恶心。         “我和朋友正在购物，然后她指着那只老鼠说，‘天哪，那是一只老鼠吗?’就在那时，我注意到它正在过道上爬。”          视频显示，这只小老鼠在大瓶洗发水下面，胆怯地沿着过道走下去。

二 |          她说:“老鼠从面包柜跑下来，朝着超市中间的冷冻食品通道跑去。”          “我拿出手机拍了下来，谁都会这样做。”          她说:“一开始我觉得它很可爱，为它感到难过，但后来我意识到它很恶心。

三 | ”          “这件事就发生在超市里，太恶心了，真的很恶心。”          她说，当她去寻求帮助时，几乎看不到任何工作人员。         她说:“我们环顾四周，因为我们不知道该怎么办，但除了收银台的工作人员外，周围没有其他工作人员。”          “我不得不走很远的地方找到一名工作人员，她拿了一个盒子，我们联手把它扣住了。

四 | ”          “然后工作人员就带着盒子里的老鼠走开了，去给她的另一个同事看。”          这位女士承认，这让她不敢再回这家店买东西了。         Newshub已经联系了Pak'nSave的所有者 Foodstuffs 公司和初级产业部（MPI）。         这也太不让人放心了。         原文链接          相关阅读：          中国游客落地南岛第一天，被Countdown的活老鼠惊呆！          恶心！奥克兰西区Pak'nSave超市羊肉包装内发现苍蝇          最新研究：新西兰鼠类横行，按目前措施很难消灭          可怕！新西兰惊现40厘米长的巨鼠          为挽回原生鸟类，奥克兰议会资助居民摆脱鼠患          家中老鼠成灾？请从清理花园做起          注：本文为编译/原创，欢迎转发分享；但严禁复制等未经授权的非法使用。

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