APOD090426- 老鼠星系/土卫16的影子/侧视星系/云中月/鲸鱼星系
本帖最后由 gohomeman1 于 2009-5-2 13:36 编辑从今天起，我将按5天或一周为单位发APOD的图。APOD的本身链接是http://apod.nasa.gov/apod/astropix.html
查询它的过去某日图可以从这个链接进去后点击下方的日历——Calendar，当然还可Search。如果知道日期，那么请参考如下格式：
http://apod.nasa.gov/apod/ap020919.html （2002.09.19的图），很简单吧。
以后每天的发帖格式如下：当日APOD原文，翻译文章，帖子本身的大图，参考链接。翻译优先选用北京天文馆和台湾成功大学物理分校的，如果两者都没有当日翻译，我一般会在晚上翻译。同好如果能翻译，不胜感激！
北京天文馆APOD镜像链接http://www.bjp.org.cn/apod/today.htm，
它很糟糕的一点是搜索、档案功能很差，如果当日没看见，过后查询很不方便，也缺乏像APOD那样方便的日期跳转功能。
成大APOD链接http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/apod.html
它的档案功能很人性化，查询过去的APOD相当方便，大家自己去看看就知道了。
第一层就作为索引吧。
2#~6#：NGC 4676 老鼠星系
7#~9#：土卫16在光环上的影子
10#~15#：NGC 4565侧视星系
17#~19#：GRB 090423:迄今测得最远的爆炸
25#~27#：鲸鱼星系 NGC 4631 2009 April 26
NGC 4676: When Mice Collide
http://apod.nasa.gov/apod/image/0904/mice_hst.jpg
Credit: ACS Science & Engineering Team, Hubble Space Telescope,NASA
Explanation:
These two mighty galaxies are pulling each other apart.Known as "The Mice" because they have such long tails, each spiral galaxy has likely already passed through the other.They will probably collide again and again until they coalesce.The longtails are created by the relative difference between gravitational pulls on the near and far parts of each galaxy. Because the distances are so large, the cosmic interaction takes place in slow motion -- over hundreds of millions of years.NGC 4676lies about 300 million light-years away toward the constellation of Bernice's Hair (Coma Berenices) and are likely membersof the Coma Cluster of Galaxies. The above picture was taken with the Hubble Space Telescope'sAdvanced Camera for Surveys which is more sensitive and images a larger field than previous Hubble cameras.The camera is scheduled to be serviced during the coming flight of Space Shuttle. 今天成大的翻译
老鼠星系NGC4676
影像提供: ACS Science & Engineering Team, Hubble Space Telescope, NASA
說明: 這兩個龐大的星系正在把對方撕開之中。因為這兩個星系的長長尾巴，所以它們被暱稱為老鼠星系 (the Mice)。這兩個螺旋星系可能已經穿過對方，不過它們應該會不停地互撞，直至完全聚合在一起為止。這些長尾的形成，是來自個別星系前端和後端所受到的重力差所致。由於這些星系的間很大，所以它們的碰撞是一種很緩慢的過程，通常要經過數億年才會完成。編號為NGC 4676的老鼠星系位在后髮座內，距離我們約有三億光年遠，它們可能都是后髮座星系團的成員。上面這張照片，是由哈伯太空望遠鏡的先進巡天相機所拍攝的，和前一代的相機比起來，不但較靈敏，而且拍攝的視野也較大。在下一次的太空梭任務中，預定將為這部相機進行維修。 ACS的图不但大而且相当的清晰，本图尺寸很大，速度比较慢，但图本身不大。
4428X4258,737KB
http://apod.nasa.gov/apod/image/0904/mice_hst_big.jpg
http://apod.nasa.gov/apod/image/0904/mice_hst_big.jpg 本帖最后由 gohomeman1 于 2009-5-24 00:44 编辑
我印象中这是ACS第一次使用时的特典图，共4张，另外还有著名的圆锥星云、蝌蚪星系等。大家可以在论坛搜索一下，也可以简单的从
http://www.astronomy.com.cn/bbs/thread-106987-1-1.html翻到第94楼起，那里已经做了search。 这个图应该是ACS的WFC通道所摄，基本规格是2048X4096*2，由于图转了一个角度，就更加大点。 卡西尼拍摄的土卫16的影子
2009 April 27
Prometheus Creating Saturn Ring Streamers
http://apod.nasa.gov/apod/image/0904/prometheusring_cassini.jpg
Credit: Cassini Imaging Team,ISS,JPL,ESA,NASA
Explanation:
What's causing those strange dark streaks in the rings of Saturn?Prometheus.Specifically, an orbital dance involvingSaturn's moon Prometheus keeps creating unusual light and dark streamers in theF-Ring of Saturn.Now Prometheus orbits Saturn just inside the thinF-ring, but ventures into its inner edge about every 15 hours.Prometheus' gravity thenpulls the closestring particles toward the 100-km moon.The result is not only a stream of brightring particles but also adark ribbon where ring particles used to be.SincePrometheusorbits faster than the ring particles, the icy moon pulls out a new streamer every pass.Sometimes, several streamers orkinks are visible at once.The abovephotograph taken in mid-January by the robotic Cassini Spacecraft orbiting Saturn.The oblong moon Prometheus is visible on the far left of the image. 北京天文馆真是好快啊，上星期五以后貌似没更新过。好吧，今天又是成大翻译的。
土衛十六的影子
影像提供與版權: Cassini Imaging Team, ISS, JPL, ESA, NASA
說明:
土星環上的異常暗帶是如何造成的？原來是普羅米修斯(Prometheus，土衛十六)。小行星(包含土衛十六)繞行在土星的F環附近，在F環上產生不尋常的亮區與暗帶。現在土衛十六的運轉軌道，每15小時會冒險通過稀薄F環內側。由於重力拉扯影響，土星環上的粒子被拉近土衛十六100公里。土星圓環上的粒子這樣的特性，不僅僅是造成土星環，還成就了黑色暗帶。由於土衛十六運行速度快於土星環上的粒子，又拉扯每個通過附近的粒子，有時候，還能同時捕捉到數個糾纏不清的暗帶。這張清晰的影像是由卡西尼號太空船，於一月中繞行土星時所拍攝，可見長形的土衛十六就在影像的左方。 貌似没说到小行星吧，不过这个不是大问题，大家理解为小卫星就是了。下面是卡西尼的大图，1018X1018
http://apod.nasa.gov/apod/image/0904/prometheusring_cassini_big.jpg
http://apod.nasa.gov/apod/image/0904/prometheusring_cassini_big.jpg 2009 April 28
NGC 4565: Galaxy on the Edge
http://apod.nasa.gov/apod/image/0904/ngc4565_ritter.jpg
Credit & Copyright: Roth Ritter(Dark Atmospheres)
Explanation:
Is our Galaxy this thin? We believe so.Magnificent spiral galaxyNGC 4565is likely similar to our own spiral galaxy, but viewed edge-on from far away.Also known as the Needle Galaxyfor its narrow profile, brightNGC 4565 is a stop on many telescopic toursof the northern sky as it lies in the faint but well-groomedconstellation ComaBerenices.This sharp color image reveals the galaxy's bulging central coredominated by light from a population of older, yellowish stars.The core is dramatically cut by obscuring dust lanes which laceNGC 4565's thin galactic plane.NGC 4565 lies about 30 million light-years distant and spans over 100,000 light-years in diameter. Visible through a small telescope, some sky enthusiasts consider NGC 4565 to be a prominent celestialmasterpiece Messier missed. 本帖最后由 gohomeman1 于 2009-4-28 14:05 编辑
成大今天果然是把以前一个很不错的翻译copy了，包括以前翻译中略过的那些文字。好吧，我就贴它了。原先的文字，我自己翻译了一个，在下面的14#楼。北京天文馆最近特别忙，这些APOD翻译更新估计就不屑了。
NGC 4565: 側對著我的星系
影像提供與 版權: Roth Ritter (Dark Atmospheres)
說明: 我們銀河系也是這麼細嗎？壯麗的螺旋星系NGC 4565是一個和我們銀河系很相似的宇宙島，就像是從很遙遠的地方側看我們銀河系一樣。明亮的NGC 4565因擁有細窄之外觀，也常被稱為是細針星系 (Needle Galaxy)，在觀賞北天星空的許多天文望遠鏡之旅中，位在后髮座內的NGC 4565常是佇留的景點之一。這張清晰的彩色影像顯示，這個星系鼓脹的核心主要是由黃色的年老恆星所組成。穿梭在細窄盤面各處的塵埃帶，鮮明地切過星系的核心。 NGC 4565距離我們大約只有三千萬光年，直徑則超過十萬光年。使用小型天文望遠鏡 探索天空的人認為，NGC 4565是梅西爾遺漏的一顆出色遺珠。
本帖最后由 gohomeman1 于 2009-4-28 13:00 编辑
APOD大图3765X2510，1.3MB。图貌似很慢，就不贴出来了。我看过了，不是星系很大，而是周围的天区非常大，中心星系本身与题图差不多大。
http://apod.nasa.gov/apod/image/0904/ngc4565_ritter_big.jpg 本帖最后由 gohomeman1 于 2009-4-28 13:04 编辑
APOD够可以的，这个星系是第4次了，而且2004、2005两次文字几乎不变，图也差不多。这是2005.7.8的，雷同的2004.4.9文字就不贴了，图还是2004年的那个比较大。
http://antwrp.gsfc.nasa.gov/apod/image/0404/n4565_hugo_full.jpg2184X1472，500KB
http://antwrp.gsfc.nasa.gov/apod/image/0404/n4565_hugo_full.jpg 本帖最后由 gohomeman1 于 2009-4-28 13:50 编辑
本楼图2400X1600，426KB，是2005年的APOD图，其实主要是天空区域大。
2005 July 8
NGC 4565: Galaxy on the Edge
http://antwrp.gsfc.nasa.gov/apod/image/0507/ngc4565_gendler_big.jpg
Credit & Copyright: Robert Gendler
Explanation:
Magnificent spiral galaxy NGC 4565 is viewed edge-on from planet Earth. Also known as the Needle Galaxy for its narrow profile, bright NGC 4565 is a stop on many telescopic tours of the northern sky as it lies in the faint but well-groomed constellation Coma Berenices. This sharp color image reveals the galaxy's bulging central core dominated by light from a population of older, yellowish stars. The core is dramatically cut by obscuring dust lanes which lace NGC 4565's thin galactic plane. A large island universe similar to our own Milky Way Galaxy, NGC 4565 is only about 30 million light-years distant, but over 100,000 light-years in diameter. In fact, some consider NGC 4565 to be a prominent celestial masterpiece Messier missed.
从行星地球看过去，壮丽的旋涡星系NGC 4565以侧边对着我们，因其细窄的外观，又被称为“针状星系”。在观赏北天星空的众多望远镜之旅中，明亮的 NGC 4565是（重要的）看点之一，它位于昏暗但规则的后发座。这张清晰的彩色影像表明，星系凸起的核心主要由泛黄的老年恒星组成。穿梭在薄薄星盘各处的尘埃带，鲜明地切过星系核心。NGC 4565是一个和我们银河系很相似的大型宇宙岛，离我们大约只有3000万光年，直径则超过10万光年。事实上，有些人认为梅西尔遗漏了这个天穹杰作。 1999.6.17的图，不大，文字就不贴了。
http://antwrp.gsfc.nasa.gov/apod/image/9906/ngc4565_mclaughlin_big.jpg 我们可以看到，现在的图配色更加鲜艳、清晰。 本帖最后由 gohomeman1 于 2009-4-29 17:48 编辑
今天的APOD已经由 sagalliant 发了，http://www.astronomy.com.cn/bbs/thread-110186-1-1.html
我这里就贴一下英文的吧。
2009 April 28
GRB 090423: The Farthest Explosion Yet Measured
http://apod.nasa.gov/apod/image/0904/grb8_gemini.jpg
Credit: Gemini Observatory /NSF /AURA, D. Fox &A. Cucchiara (Penn State U.), and E. Berger (Harvard Univ.)
Explanation:
An explosion so powerful it was seen clear across the visible universewas recorded in gamma-radiation last week by NASA's orbiting Swift Observatory.Farther than any known galaxy, quasar, or optical supernova, the gamma-ray burst recorded last week was clocked at redshift 8.2, making it the farthest explosion of any type yet detected.Occurring only 630 million years after the Big Bang, GRB 090423 detonated so early that astronomers had no direct evidence that anything explodable even existed back then.The faint infrared afterglow of GRB 090423 was recovered by large ground telescopes within minutes of being discovered.The afterglow is circled in the above picture taken by the large Gemini North Telescope in Hawaii, USA.An exciting possibility is that this gamma-ray burst occurred in one of the very first generation of stars and announced the birth of an early black hole. Surely, GRB 090423 provides unique data from a relatively unexplored epoch in our universe and a distant beacon from which the intervening universe can be studied. 今天的北京天文馆翻译很快，翻译请参考http://www.astronomy.com.cn/bbs/thread-110186-1-1.html
下面是成大的翻译。
GRB 090423: 最遙遠的天體
說明: 美國NASA的快捷衛星(Swift satellite)上週捕捉到一個非常強烈的伽瑪射線暴，這是迄今人類觀測到距離地球最遠的天體，比星系、類星體(quasar)或者是超新星都還要遙遠。透過測量發現這個伽瑪射線暴的紅位移量高達8.2，也是迄今人類觀測最大的紅位移。該天體(GRB 090423)形成於大霹靂後的6.3億年，由於該天體爆炸事件相當遠以至於天文學家沒有直接的證據來估計他的距離。這張由美國 夏威夷的大型的天文望遠鏡(雙子星北座天文台)所拍攝的星體，其亮度僅維持了數分鐘。伽瑪射線暴形成的可能是因為在宇宙的第一代恆星，同時也產生了一個早期的黑洞。我們肯定的是，GRB 090423提供了這個未知的宇宙的重要資料，同時也是一個宇宙大小的地標。 看上去，确实是北京天文馆翻译的更好些。
APOD的原图，也不大：1039X1038
http://apod.nasa.gov/apod/image/0904/grb8_gemini_big.jpg
http://apod.nasa.gov/apod/image/0904/grb8_gemini_big.jpg 今天的APOD实效性也比较好，大家都知道最近是新月吧，今天的APOD就是乌云中穿行的新月
2009 April 30
Framed by Clouds
http://apod.nasa.gov/apod/image/0904/img8188_lawrence.jpg
Credit &Copyright: Pete Lawrence(Digital-Astronomy)
Explanation:
Last Sunday's fading evening twilight featured a young crescent Moonalong the western horizon.The young Moon also shared the sky with the lovelyPleiades star cluster andwandering planet Mercury.Framed by clouds in thissereneskyscape from Selsey, UK,a similar twilight scene was visible around the globe.Emerging from the cloud bank below the Pleiades, thenarrow sunlit lunar crescentis overexposed.Still, the Moon's dim night side is impressively clear, illuminated byearthshine.Bright, innermostplanet Mercury lies near thebottom of the field.Mercury will remain near the Pleiades,low in the westafter sunset over the coming days, anongoing conjunction of planet and star cluster that will offerskygazers some excellent binocular views.
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