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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.
UNI ING。    週四上午，WNBA常規賽繼續展開爭奪，屆時火焰將主迎天貓。

二 | 天貓為聯盟一姐，球隊實力強橫，加上對賽佔優，天貓此行攻陷火焰冇難度。
    
    　　火焰頭32場常規賽戰罷已經輸了19場，勝率四成出頭，這支新軍的整體發揮較為平庸。儘管她們最近2個主場先後擊敗節奏以及暴風，但主場兩連勝之前，球隊剛遭遇主場四連敗，換言之火焰近6個主場輸了4場，其最近主場戰鬥力相對一般。卡拉莉特是球隊今季得分王，但該球員是役因傷上陣成疑，其他諸如碧捷卡列頓(今季均場得14.6分)以及美根迪萊奧等人需要分擔得分壓力。

三 | 此番面對強敵天貓，火焰唯有輸少當贏。陣容方面，菲亞根以及艾美奧干克禾因不同原因缺席。
    
    　　天貓目前以79.4%的勝率領跑排行榜，球隊今季整體表現絕佳。陣中多達4人均場得分15+，分別是奧莉維婭米爾斯(20分)、納菲莎高妮亞(19分)、麥拜莉(18.4分)以及N.侯活(15.4分)，球隊陣容極具競爭力。另外天貓近9場作客取勝8場，球隊最近作客表現令人飲得杯落。

四 | 考慮到今季頭2次面對火焰全部獲勝，期間均場淨勝分高達20.5分，且最近一次交鋒，麥拜莉斬獲全場最高的24分，其中三分8中4，外線手感出色。有見及此，天貓此行必勝無疑。

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Published on:09:10:36