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2021年09月08日:仙女大星系方向的深空影像-(The Deep Sky Toward Andromeda)
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欢迎来到人生天地间
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2017年11月29日:M42:猎户座大星云-(M42: The Great Orion Nebula)
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2017年08月06日:银河与炸裂的流星-(Milky Way and Exploding Meteor)
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2024年02月11日:直指月亮的火箭烟尘影子-(Rocket Plume Shadow Points to the Moon)
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2020-05-14
2020年05月14日:哈雷彗星与史汪彗星-(Comet Halley vs Comet SWAN)
2020年05月14日:哈雷彗星与史汪彗星-(Comet Halley vs Comet SWAN)--原图下载{mtitle title="哈雷彗星与史汪彗星"/}Image Credit &Copyright:Luc Perrot(TWAN)说明: 在无月光干扰的5月3日清晨,一颗来自宇宙的尘埃掠过留尼旺岛上方的南天。它是地球穿过哈雷彗星留下的碎片流时,所形成的宝瓶座流星雨的流星之一。这幅具有启发性的影像,记录了一颗明亮的宝瓶座流星,在云海的上方从左向右飞掠。它的流星迹,可回溯到这幅影像上缘之外,高悬在东方地平线上空的宝瓶座内之流星雨辐射点。以高速着称的宝瓶座流星,穿入大气的速率大约是每秒66公里,发光的高度在地表上方约100公里之处。在这幅夜景里,火山峰顶的中左方,还可以见到离地球约6光分,顶着淡绿彗发曳着长尾的史汪彗星。目前出现在北天曙光时分的东方地平线附近之史汪彗星,亮度不如预期。这颗首度来访的彗星,在2天前刚通过最靠近地球的位置,接着会在5月27日运行到近日点。{lamp/}原文:{mtitle title="Comet Halley vs Comet SWAN"/}Image Credit &Copyright:Luc Perrot(TWAN)Explanation: The pre-dawn hours of May 3rd were moonlessas grains of cosmic dust streaked through southern skiesabove Reunion Island.Swept up as planet Earth plowed through dusty debris streams leftbehind periodicComet 1/P Halley,the annual meteor shower isknown as the Eta Aquarids.This inspired exposure captures a bright aquarid meteor flashingleft to right over a sea of clouds.The meteor streak points back to the shower'sradiant in the constellation Aquarius,well above the eastern horizon and off the top of the frame.Known for speed Eta Aquarid meteors move fast,entering the atmosphere at about 66 kilometers per second,visible at altitudes of 100 kilometers or so.Then about 6 light-minutes from Earth, thepale greenish coma and long tailof Comet C/2020 F8 SWAN werenot to be left out of the celestial scene, posing abovethe volcanic peaks left of center.Now in the northern sky's morning twilight near the eastern horizonComet SWAN has not become asbright as anticipated though.This first time comet made its closest approach to planet Earth only two daysago and reaches perihelion on May 27.
2020年05月14日
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2019-05-10
2019年05月10日:哈雷彗星的尘埃和银河-(Halley Dust and Milky Way)
2019年05月10日:哈雷彗星的尘埃和银河-(Halley Dust and Milky Way)--原图下载{mtitle title="哈雷彗星的尘埃和银河"/}Image Credit &Copyright:Gang Li说明: 5月7日那晚,宇宙尘埃微粒飞掠在几乎无月光干扰的夜空中。这群年年复现的宝瓶座[η]流星雨,源自地球穿过哈雷彗星留下的碎片流。这些叠加在背景夜空照片上的流星迹,虽然摄于这群流星雨预测的极大期隔天,但在2小时期间,摄影者仍然捕捉到20颗流星。从澳洲.雪梨(悉尼)南方100公里的拍摄点看出去,这些流星迹,可回溯到邻近地平线的暗星宝瓶座η附近之辐射点。以高速着称的宝瓶座流星,穿过地球大气的速率大约是每秒66公里。影像中,还可见到位在高悬银河中心鼓核附近的明亮木星,以及恰好嵌在右上角的南十字。{lamp/}原文:{mtitle title="Halley Dust and Milky Way"/}Image Credit &Copyright:Gang LiExplanation: Grainsof cosmic dust streaked through the mostly moonlessnight skies of May 7.Swept up as planet Earth plowed through thedebris streams left behind byperiodic Comet Halley,the annual meteor shower is known as theEta Aquarids.Though it was made about a day after the shower's predicted maximum,this composite image still captures 20 meteors in exposures takenover a 2 hour period, registered on a background exposure of the sky.The meteor trails point back to theshower radiant neareponymous faint star Eta Aquarii close to the horizon, seen from100 kilometers south of Sydney Australia.Known for speed, Eta Aquarid meteors move fast,entering the atmosphere at about 66 kilometerspersecond.Brilliant Jupiter shines near the central bulge of the MilkyWay high above the horizon.The Southern Cross is just tucked in to the upper rightcorner of the frame.
2019年05月10日
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2018-10-30
2018年10月30日:内蒙古上空的猎户座流星-(Orionids Meteors over Inner Mongolia)
2018年10月30日:内蒙古上空的猎户座流星-(Orionids Meteors over Inner Mongolia)--原图下载{mtitle title="内蒙古上空的猎户座流星"/}Image Credit & Copyright: Yin Hao说明: 流星不停的从猎户座射出来。不过,这是预料中的现象,因为每年的十月是猎户座流星雨的季节。上面这幅去年十月摄于中国.内蒙古的影像,呈现了20多颗接连出现在乌兰哈达火山上空的流星。这张主题影像里的众多流星痕 ,都可回溯到猎户腰带左上方,称为辐射点的小片天区。猎户座流星的前身,是哈雷彗星历次回归内太阳系时,所喷出的沙粒大小碎片。哈雷彗星其实造成了二群已知的流星雨,另一群是在每年五月可见的宝瓶η流星雨。每日天文图在一年前的今天所呈现之猎户座流星影像,除了摄于相同地点之外,也记录了同一部车子。在下个月,坦普─塔托彗星所造成的狮子座流星雨,应该会出现一些很明亮的流星痕。{lamp/}原文:{mtitle title="Orionids Meteors over Inner Mongolia"/}Image Credit & Copyright: Yin HaoExplanation: Meteors have been shooting out from the constellation of Orion. This was expected, as October is the time of year for the Orionids Meteor Shower. Pictured here, over two dozen meteors were caught in successively added exposures last October over Wulan Hada volcano in Inner Mongolia, China.The featured image shows multiple meteor streaks that can all be connected to a single small region on the sky called the radiant,here visible just above and to the left of the belt of Orion, The Orionids meteors started as sand sized bits expelled from Comet Halley during one of its trips to the inner Solar System. Comet Halley is actually responsible for two known meteor showers, the other known as the Eta Aquarids and visible every May. An Orionids image featured on APOD one year ago today from the same location shows the same car. Next month, the Leonids Meteor Shower from Comet Tempel-Tuttle should also result in some bright meteor streaks.
2018年10月30日
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2017-10-30
2017年10月30日:猎户座流星雨-(Orionid Meteors from Orion)
2017年10月30日:猎户座流星雨-(Orionid Meteors from Orion)--原图下载{mtitle title="猎户座流星雨"/}Image Credit & Copyright: Lu Shupei说明: 流星不停的从猎户座射出来。不过,这是预料中的现象,因为每年的十月是猎户座流星雨的季节。上面这幅上个周末摄于中国.内蒙古的影像,呈现了超过12颗接连出现在乌兰哈达火山上空的流星。这张主题影像里的多重流星痕,都可回溯到猎户腰带左上方,称为辐射点的小片天区。猎户座流星的前身,是哈雷彗星历次回归太阳系内围时,所喷出的沙粒大小碎片。哈雷彗星其实造成了二群已知的流星雨,另一群是在每年五月可见的宝瓶η流星雨。在下个月,坦普─塔托彗星所造成的狮子座流星雨,应该会出现一些很明亮的流星痕。{lamp/}原文:{mtitle title="Orionid Meteors from Orion"/}Image Credit & Copyright: Lu ShupeiExplanation: Meteors have been shooting out from the constellation of Orion. This was expected, as October is the time of year for the Orionids Meteor Shower. Pictured here, over a dozen meteors were caught in successively added exposures last weekend over Wulan Hada volcano in Inner Mongolia, China.The featured image shows multiple meteor streaks that can all be connected to a single small region on the sky called the radiant,here visible just above and to the left of the belt of Orion, The Orionids meteors started as sand sized bits expelled from Comet Halley during one of its trips to the inner Solar System. Comet Halley is actually responsible for two known meteor showers, the other known as the Eta Aquarids and visible every May. Next month, the Leonids Meteor Shower from Comet Tempel-Tuttle should also result in some bright meteor streaks.
2017年10月30日
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2014-05-02
2014年05月02日:半圆丘的星空-(That Night over Half Dome)
2014年05月02日:半圆丘的星空-(That Night over Half Dome)--原图下载{mtitle title="半圆丘的星空"/}Image Credit &Copyright: Rogelio BernalAndreo (Deep Sky Colors)说明: 这幅由8张摄于去年五月某个夜晚的照片接成之影像,沿着美国.优胜美地国家公园的北侧路(左侧)向右伸展。而影像的终点则在弧状银河右侧的银河中心,远在公园崎岖天际线后方约数千光年之处。那夜当雷暴云退却之时,月亮尚未东升,所以周遭山峰岩壁上的亮光是来自营火及其他人为光源。优胜美地瀑布位在影像左侧,半圆丘 (Half Dome)的岩面,耸立在影像中央远处的地平线之上。而它上方则有宝瓶座亮流星所留下的美丽流迹;这颗流星自下而上飞掠,流迹回指位在宝瓶座底部之处的辐射点。随着地球再次穿过哈雷彗星彗尾的尘埃,今年的宝瓶座流星雨的极大期,预测将出现在5月6日无月光干扰的清晨。{lamp/}原文:{mtitle title="That Night over Half Dome"/}Image Credit &Copyright: Rogelio BernalAndreo (Deep Sky Colors)Explanation: Captured one nightlast May this eight frame mosaic startson the left, down Northside Drive throughYosemite National Park.It ends thousands of light-years away though, as the arc ofthe Milky Way tracks toward thecenter of our galaxy on the right,far beyond the park's rugged skyline.That night was still moonless when the storm clouds retreated, so therocky facesof the surrounding mountains are lit by campfires andartificial lights.YosemiteFalls is at the left.The graniteface of Half Dome juts above the farhorizon, near the center of the view.The remarkable flash above it is a bright meteor.Part of the annual Eta Aquarid meteor shower the colorfulstreak is moving up, its trail pointing directlyback to the shower's radiant,low in Aquarius.Thisyear's Eta Aquarids should peak in the moonlessearly morning hours of May 6 as the Earth sweeps through dustfrom the tail of Comet Halley.
2014年05月02日
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2010-01-04
2010年01月04日:哈雷彗星的彗核:太空中的雪球-(Comet Halley's Nucleus: An Orbiting Iceberg)
2010年01月04日:哈雷彗星的彗核:太空中的雪球-(Comet Halley's Nucleus: An Orbiting Iceberg)--原图下载{mtitle title="哈雷彗星的彗核:太空中的雪球"/}Credit & Copyright: Halley Multicolor Camera Team,Giotto Project,ESA说明: 彗星核心的长相如何?彗核组成为太阳系的原始材料,被认为是由非常髒的雪球聚集而成。当彗星行经太阳附近时,彗星冰质核心通常被蒸发出来的不透光尘埃和气体给遮住了,所以在地面望远镜看不到彗核,仅仅只能清楚地解析出彗发以及彗尾特徵。不过,在1986年欧洲太空船吉欧托(Giotto)成功地成为第一个最接近彗星并且拍下彗核影像,这是哈雷彗星在靠近太阳时所拍下的影像。吉欧托(Giotto)摄录的影像经常被用来强化彗核宽达15公里的马铃薯外型。当气体和尘埃飞往哈雷彗星的彗发时显露出右侧暗色的彗核特徵。每76年哈雷彗星回归,每次回归彗核将耗损6公尺厚的尘埃碎粒至外太空。哈雷彗星遗落在行径的碎片,造成每年10月份的Orionids 流星雨以及每年5月份的Eta Aquariids流星雨。{lamp/}原文:{mtitle title="Comet Halley's Nucleus: An Orbiting Iceberg"/}Credit & Copyright: Halley Multicolor Camera Team,Giotto Project,ESAExplanation: What does a comet nucleus look like?Formed from theprimordial stuff of the Solar System, comet nuclei werethought to resemble very dirty icebergs.But ground-basedtelescopes revealed only the surroundingcloud of gas and dust of active comets nearing the Sun,clearly resolving only thecomet's coma, andthe characteristic cometary tails.In 1986, however, the European spacecraftGiottobecame one of the firstgroup of spacecraftever to encounter andphotograph the nucleus of a comet, passing andimaging Halley's nucleus as it approached the sun.Data from <ahref="http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1985-056A-01">Giotto's camera wereused to generatethis enhanced image of the potato shaped nucleus thatmeasures roughly 15 kilometers across. Some surface features on thedarknucleus are on the right, while gas and dustflowing into Halley's coma are on the left.Every 76 yearsCometHalley returns to the inner Solar Systemand each time thenucleus sheds about a 6-meter deep layer of itsice and rock into space. This debris shed fromHalley's nucleus eventually disperses into an orbiting trail responsible for theOrionidsmeteor shower,in October of every year, and theEta Aquariids meteor shower every May.
2010年01月04日
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