打架成本警示牌

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。    週日上午，WNBA常規賽將上演是日的最後一場較量，由夢想作客挑戰水星。

二 | 雙方實力差距懸殊，近況也相當低迷的水星今仗唯有輸少當贏。
    
    　　水星上仗主場與新軍火焰過招，球隊從首節起就一直領先，沒想到卻在末節被對手翻盤慘遭逆轉，最終以85比88落敗，這場失利也極大的打擊了球隊的士氣。該役過後，水星過去5場常規賽輸掉了其中的4場，球隊近期狀態相當低迷。

三 | 水星賽季至今的勝率僅有36.1%，與是役對手夢想的63.9%相差甚遠，可見雙方實力差距相當之大。另外，雖然水星今仗是主場作戰，但是賽季至今她們16次主場出擊只取勝5場，是全聯盟主場取勝場次最少的隊伍之一。綜上所述，水星是役恐怕是打定輸數。

四 |
    
    　　夢想目前以23勝13負的戰績排在積分榜第五位，球隊實力和整體發揮遠超水星。

五 | 上仗作客挑戰火花一役，夢想全隊手感發燙，全隊命中率達到63.9%，其中三分命中率更是高達61.5%，最終也是以124比88大勝火花。加上這場勝利，夢想已取得作客三連勝，過去6次作客也是取勝5場，球隊作客戰鬥力極為強悍。值得一提的是，安祖列絲上仗再次貢獻兩雙數據之後，她今季的兩雙數已達到25次，離自己的個人紀錄僅差1次，而離歷史紀錄則只差3次，在常規賽進入尾聲階段的情況下，安祖列絲必然會力爭打破兩雙紀錄。陣容方面，比安娜鐘斯因傷缺陣。