冥王星

版主: 可人兒, 人之初

     

冥王星

文章ochow » 週三 4月 15日, 2015年 6:28 pm

First Pluto-Charon Color Image from New Horizons

Release Date: April 14, 2015
Keywords: N/A

圖檔

This image of Pluto and its largest moon, Charon, was taken by the Ralph color imager aboard NASA's New Horizons spacecraft on April 9 and downlinked to Earth the following day. It is the first color image ever made of the Pluto system by a spacecraft on approach. The image is a preliminary reconstruction, which will be refined later by the New Horizons science team. Clearly visible are both Pluto and the Texas-sized Charon. The image was made from a distance of about 71 million miles (115 million kilometers)-roughly the distance from the Sun to Venus. At this distance, neither Pluto nor Charon is well resolved by the color imager, but their distinctly different appearances can be seen. As New Horizons approaches its flyby of Pluto on July 14, it will deliver color images that eventually show surface features as small as a few miles across.
圖檔

以愛的方式經營代替沒有愛的模式,也是一種顛覆 --- 曾錦強

嘩!晌168真係好L驚呀!踢爆左假殖仁不學無術、表裡不一,假殖仁立刻化身成情緒的動物,要被批鬥1000版呀!
頭像
ochow
 
文章: 7854
註冊時間: 週六 9月 3日, 2005年 12:30 am
來自: 香港地產城 http://forum.hkpropertycity.net

     

Re: 冥王星

文章ochow » 週三 4月 15日, 2015年 6:29 pm

April 14, 2015

NASA's New Horizons Nears Historic Encounter with Pluto



NASA's New Horizons spacecraft is three months from returning to humanity the first-ever close up images and scientific observations of distant Pluto and its system of large and small moons.

"Scientific literature is filled with papers on the characteristics of Pluto and its moons from ground based and Earth orbiting space observations, but we've never studied Pluto up close and personal," said John Grunsfeld, astronaut, and associate administrator of the NASA Science Mission Directorate at the agency's Headquarters in Washington. "In an unprecedented flyby this July, our knowledge of what the Pluto systems is really like will expand exponentially and I have no doubt there will be exciting discoveries."

The fastest spacecraft ever launched, New Horizons has traveled a longer time and farther away - more than nine years and three billion miles - than any space mission in history to reach its primary target. Its flyby of Pluto and its system of at least five moons on July 14 will complete the initial reconnaissance of the classical solar system. This mission also opens the door to an entirely new "third" zone of mysterious small planets and planetary building blocks in the Kuiper Belt, a large area with numerous objects beyond Neptune's orbit.

The flyby caps a five-decade-long era of reconnaissance that began with Venus and Mars in the early 1960s, and continued through first looks at Mercury, Jupiter and Saturn in the 1970s and Uranus and Neptune in the 1980s.

Reaching this third zone of our solar system - beyond the inner, rocky planets and outer gas giants - has been a space science priority for years. In the early 2000s the National Academy of Sciences ranked the exploration of the Kuiper Belt - and particularly Pluto and its largest moon, Charon - as its top priority planetary mission for the coming decade.

New Horizons - a compact, lightweight, powerfully equipped probe packing the most advanced suite of cameras and spectrometers ever sent on a first reconnaissance mission - is NASA's answer to that call.

"This is pure exploration; we're going to turn points of light into a planet and a system of moons before your eyes!" said Alan Stern, New Horizons principal investigator from Southwest Research Institute (SwRI) in Boulder, Colorado. "New Horizons is flying to Pluto — the biggest, brightest and most complex of the dwarf planets in the Kuiper Belt. This 21st century encounter is going to be an exploration bonanza unparalleled in anticipation since the storied missions of Voyager in the 1980s."

Pluto, the largest known body in the Kuiper Belt, offers a nitrogen atmosphere, complex seasons, distinct surface markings, an ice-rock interior that may harbor an ocean, and at least five moons. Among these moons, the largest - Charon - may itself sport an atmosphere or an interior ocean, and possibly even evidence of recent surface activity.

"There's no doubt, Charon is a rising star in terms of scientific interest, and we can't wait to reveal it in detail in July," said Leslie Young, deputy project scientist at SwRI.

Pluto's smaller moons also are likely to present scientific opportunities. When New Horizons was started in 2001, it was a mission to just Pluto and Charon, before the four smaller moons were discovered.

The spacecraft's suite of seven science instruments - which includes cameras, spectrometers, and plasma and dust detectors - will map the geology of Pluto and Charon and map their surface compositions and temperatures; examine Pluto's atmosphere, and search for an atmosphere around Charon; study Pluto's smaller satellites; and look for rings and additional satellites around Pluto.

NASA Logo
See the graphics from the April 14 New Horizons Pluto Encounter Preview at NASA Headquarters.

Currently, even with New Horizons closer to Pluto than the Earth is to the Sun, the Pluto system resembles little more than bright dots in the distance. But teams operating the spacecraft are using these views to refine their knowledge of Pluto's location, and skillfully navigate New Horizons toward a precise target point 7,750 miles (12,500 kilometers) from Pluto's surface. That targeting is critical, since the computer commands that will orient the spacecraft and point its science instruments are based on knowing the exact time and location that New Horizons passes Pluto.

"Our team has worked hard to get to this point, and we know we have just one shot to make this work," said Alice Bowman, New Horizons mission operations manager at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland, which built and operates the spacecraft. "We've plotted out each step of the Pluto encounter, practiced it over and over, and we're excited the ‘real deal' is finally here."

The spacecraft's work doesn't end with the July flyby. Because it gets one shot at its target, New Horizons is designed to gather as much data as it can, as quickly as it can, taking about 100 times as much data on close approach as it can send home before flying away. And although the spacecraft will send select, high-priority datasets home in the days just before and after close approach, the mission will continue returning the data stored in onboard memory for a full 16 months.

"New Horizons is one of the great explorations of our time," said New Horizons Project Scientist Hal Weaver at APL. "There's so much we don't know, not just about Pluto, but other worlds like it. We're not rewriting textbooks with this historic mission - we'll be writing them from scratch."

APL manages the New Horizons mission for NASA's Science Mission Directorate in Washington. Alan Stern of SwRI is the principal investigator. SwRI leads the science team, payload operations and encounter science planning. New Horizons is part of the New Frontiers Program, managed by NASA's Marshall Space Flight Center in Huntsville, Alabama.

http://pluto.jhuapl.edu/News-Center/New ... e=20150414
圖檔

以愛的方式經營代替沒有愛的模式,也是一種顛覆 --- 曾錦強

嘩!晌168真係好L驚呀!踢爆左假殖仁不學無術、表裡不一,假殖仁立刻化身成情緒的動物,要被批鬥1000版呀!
頭像
ochow
 
文章: 7854
註冊時間: 週六 9月 3日, 2005年 12:30 am
來自: 香港地產城 http://forum.hkpropertycity.net

     

Re: 冥王星

文章xdboy » 週五 4月 17日, 2015年 12:28 am

最巧影埋天王海王星啦真械,
氣牙。
圖檔
*** 流浪中的大皇 言論不是建議 純粹學術討論
*** To obtain people's faith, there must be two things:-
    Impartial judgement, and Impartial tax.
    === Reinhard von Lohengramm ===
*** The bureaucratic mentality is the only constant
     in the Universe... === Dr McCoy ===
我的音樂主題 ζ▂⊙_⊙
頭像
xdboy
 
文章: 23158
註冊時間: 週二 6月 17日, 2008年 11:51 pm
來自: Martian Sarcastica

     

Re: 冥王星

文章ochow » 週三 1月 2日, 2019年 12:02 am

距地球65億公里】NASA新視野號 飛掠人類發現最遠小行星

3小時前

即時國際


新視野號周一飛越小行星前傳回的照片(互聯網)

美國太空總署(NASA)在2019年首天就迎來新壯舉!無人探測船「新視野號」(New Horizons)周二飛越人類史上發現距地球最遠、甚至可能是最古老的小行星,NASA希望透過這次任務,了解究竟行星是如何形成。

「新視野號」首席研究員斯特恩(Alan Stern)與團隊在新年伊始,於馬里蘭州約翰霍普金斯大學應用物理實驗室觀看探測船在美國時間周二凌晨零時33分(香港周二下午1時33分),掠過距地球65億公里外的「Ultima Thule」。

「新視野號」今次任務是創下太空船史上航行最遠距離,而配備的鏡頭亦讓科學家可首次近距離觀看這顆小行星。「新視野號」以時速逾5.1萬公里,在距離「Ultima Thule」表面3,540公里掠過,由於「Ultima Thule」與地球相距太遠,NASA與「新視野號」互傳訊號至少要歷時6小時才能接收到,估計掠過小行星後第一個訊號要待本港時間周二晚才能傳回地球。

「Ultima Thule」是2014年在哈勃太空望遠鏡的幫助下發現,估計長度有19至32公里,一張從193萬公里外拍攝的「Ultima Thule」模糊照片在周一發佈,外型彷似是水滴。「新視野號」掠過「Ultima Thule」的數秒內,會拍攝大約900張照片,較清晰的照片預計會在未來3天接收到。

斯特恩形容「Ultima Thule」是獨一無二,因為它是太陽系早期的產物,或可為其他行星的起源提供答案,「它處於極度冷凍狀態,因此仍完美保持其原來的結構。我們要研究Ultima的一切,包括它的結構到地質,及最初如何組成,是否有衞星和大氣層及其他東西,讓我們了解太陽系物體的原始組成環境。」

「新視野號」於2006年1月升空,經過9年長征飛行後,2015年飛越冥王星,再續向「Ultima Thule」進發。「新視野號」體積只有鋼琴般大,速度是所有太空船中最快。
圖檔

以愛的方式經營代替沒有愛的模式,也是一種顛覆 --- 曾錦強

嘩!晌168真係好L驚呀!踢爆左假殖仁不學無術、表裡不一,假殖仁立刻化身成情緒的動物,要被批鬥1000版呀!
頭像
ochow
 
文章: 7854
註冊時間: 週六 9月 3日, 2005年 12:30 am
來自: 香港地產城 http://forum.hkpropertycity.net

     

Re: 冥王星

文章ochow » 週五 1月 4日, 2019年 10:01 am

最遠小天體「天涯海角」似雪人

2019-01-04

國際新聞


「天涯海角」外形猶如雪人。

美國太空總署探測器「新視野號」周二飛掠過最遙遠小天體「天涯海角」(Ultima Thule),成功向地球傳回照片,揭開其神秘面紗。科學家徹夜分析照片後,前日召開記者會指長期冰封的「天涯海角」形狀像個大「雪人」。

自「哈勃」太空望遠鏡2014年模糊地拍到這個位於太陽系邊緣柯伊柏帶、距離地球64億公里的小天體後,科學家從未如此清晰地見過它的真面目。任務首席科學家斯特恩(Alan Stern)形容,「新視野號」傳回影像解像度高,技術「太2018年了」,「天涯海角」不再是以往他們認知的「保齡球樽狀」而是個「雪人」。

或有山脈存在

科學家透過影像進一步證實到「天涯海角」是個「密接聯星」(Contact Binary)。它全長33公里,由兩個球體組成,一大一小;斯特恩指,「我們不太有創意」,所以大的叫「天涯」(Ultima),只有它1/3面積的小球體叫「海角」(Thule)。科學家估計,早在45億年前,兩個球體分別由旋轉的冰和塵埃粒子組成,兩者在太陽系交會,以每小時數公里的緩慢速度相撞,並從此結合在一起,成為密接聯星。

另有彩色影像顯示「天涯海角」略帶紅色,連接兩個球體的頸部有一圈較亮、較淡色的物質,應該是由球體掉落下來的物質。任務的地理小組科學家穆爾亦分析,小天體斑駁、佈滿深色條紋的外表,顯示或會有山脈和山脊存在。
美國《紐約時報》/法新社
圖檔

以愛的方式經營代替沒有愛的模式,也是一種顛覆 --- 曾錦強

嘩!晌168真係好L驚呀!踢爆左假殖仁不學無術、表裡不一,假殖仁立刻化身成情緒的動物,要被批鬥1000版呀!
頭像
ochow
 
文章: 7854
註冊時間: 週六 9月 3日, 2005年 12:30 am
來自: 香港地產城 http://forum.hkpropertycity.net

     

Re: 冥王星

文章go2 » 週五 1月 4日, 2019年 10:49 am

呢啲新聞證明美國人真係好小氣,仲要老作乜嘢天涯海角好特別好難有,呢啲小行星係大陽系外圍大卵把啦。


:lol:
go2
 
文章: 4044
註冊時間: 週二 12月 28日, 2010年 1:52 am


回到 茶餘飯後

誰在線上

正在瀏覽這個版面的使用者:沒有註冊會員 和 5 位訪客