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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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2021-10-28
2021年10月28日:奎宿九之魂-(Mirach's Ghost)
2021年10月28日:奎宿九之魂-(Mirach's Ghost)--原图下载{mtitle title="奎宿九之魂"/}Image Credit &Copyright:John Chumack说明: 以鬼魂的标准来看,奎宿九之魂其实惊吓度并不高。事实上,奎宿九之魂是个天文学家很熟悉的模糊黯淡星系,它之所以得名,只是恰好出现在亮星奎宿九的视线方向附近而已。在这片星场中心的天体就是奎宿九,它亦名为仙女座β星。离我们大约200光年远的奎宿九,是一颗红巨星,表面温度比太阳低,不过体积远比大阳大,也因此其真实亮度也远大于太阳。在大多数的望远镜影像里,奎宿九炫目的星光和它产生的绕(衍)射星芒,常遮住它附近的天体,也让这个黯淡模糊的星系,看起像是镜筒内反射炫光所产生的鬼影。不过在这幅清晰的影像里,它以弥漫光斑之姿出现奎宿九的右上方。奎宿九之魂的编录号是NGC 404,距离我们大约有一千万光年远。(Mirach's Ghost 奎宿九之魂){lamp/}原文:{mtitle title="Mirach's Ghost"/}Image Credit &Copyright:John ChumackExplanation: As far asghosts go, Mirach's Ghost isn't really thatscary.Mirach's Ghost is just a faint, fuzzy galaxy, well known to astronomers,that happens to be seen nearly along the line-of-sight toMirach,a bright star.Centered in this star field,Mirach is also called Beta Andromedae.About 200 light-years distant, Mirach is a redgiant star, cooler than the Sun butmuch larger and so intrinsically much brighter than ourparent star.In most telescopic views, glare anddiffractionspikes tend to hide things that lie near Mirach and make thefaint, fuzzy galaxylook like a ghostly internal reflection of the almostoverwhelming starlight.Still, appearing inthis sharp imagejust above and to the right of Mirach,Mirach's Ghost is cataloged asgalaxy NGC 404and is estimatedto be some 10 million light-years away.
2021年10月28日
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2021-09-08
2021年09月08日:仙女大星系方向的深空影像-(The Deep Sky Toward Andromeda)
[2021年09月08日:仙女大星系方向的深空影像-(The Deep Sky Toward Andromeda)--原图下载](https://apod.nasa.gov/apod/image/2109/M31WideField_Ziegenbalg_1400.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2109/M31WideField_Ziegenbalg_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2109/M31WideField_Ziegenbalg_960.jpg';){mtitle title="仙女大星系方向的深空影像"/}Image Credit & License: Stefan Ziegenbalg说明: 仙女大星系周围有什么天体?在太空远处的仙女大星系(M31),紧邻的区域内有数个小型伴星系,更外围有包括我们银河系在内的本星系群成员。在地球的天空中,近在我们银河系之内的星云,看似环拱在M31的周围,形成类似地球大气的水汽云包覆在月亮周边的景观。只不过,仙女大星系方向的气体云,通常过于昏暗而不得见。上面这张45度跨幅的主题影像,是仙女大星系方向有史以来最长曝光的较大範围影像之一。这幅摄于特定氢气辐射波段的影像,除了无比清晰的呈现这方向昏暗且陌生的星云之外,更捕捉到其他的景观。其中包括影像顶端的三角大星系(M33);它是本星系群第三大的成员,也是人类肉眼所能见到的最遥远天体。在M33的右下方,则有银河系内的亮星奎宿九(Mirach)。这幅摄于德国.普尔斯尼茨镇的影像,是由在2018年至2021年之间所记录的数个长曝光数据组合而成。{lamp/}原文:{mtitle title="The Deep Sky Toward Andromeda"/}Image Credit & License: Stefan ZiegenbalgExplanation: What surrounds the Andromeda galaxy? Out in space, Andromeda (M31) is closely surrounded by several small satellite galaxies, and further out it is part of theLocal Group of Galaxies -- of which our Milky Way galaxy is also a member.On the sky, however, gas clouds local to our Milky Way appear to surround M31 -- not unlike how water clouds in Earth's atmosphere may appear to encompass our Moon. The gas clouds toward Andromeda, however, are usually too faint to see. Enter the featured 45-degree long image -- one of the deeper images yet taken of the broader Andromeda region.This image, sensitive to light specifically emitted by hydrogen gas, shows these faint and unfamiliar clouds in tremendous detail.But the image captures more. At the image top is the Triangulum galaxy (M33), the third largest galaxy in the Local Group and the furthest object that can be seen with the unaided eye. Below M33 is the bright Milky-Way star Mirach.The image is the digital accumulation of several long exposures taken from 2018 to 2021 from Pulsnitz, Germany.
2021年09月08日
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2017-10-27
2017年10月27日:奎宿九之魂-(Mirach's Ghost)
2017年10月27日:奎宿九之魂-(Mirach's Ghost)--原图下载{mtitle title="奎宿九之魂"/}Image Credit &Copyright:Kent Wood说明: 以鬼魂的标准来看,奎宿九之魂其实并惊吓度不高。事实上,奎宿九之魂是个天文学家很熟悉的模糊黯淡星系,它只是恰好出现在亮星奎宿九的视线方向附近而已。在这张星场影像中央的天体就是奎宿九,它亦名为仙女座β星。离我们大约200光年的奎宿九,是一颗红巨星,表面温度比太阳低,不过体积远比大阳大,也因此其真实亮度也远大于太阳。在大多数的望远镜影像里,奎宿九炫目的星光和它产生的绕(衍)射星芒,常遮掩了它附近的天体,也让这个黯淡模糊的星系,看起像是镜筒内反射炫光所产生的鬼影。在这幅清晰的影像里,它是位在奎宿九左上方的弥漫光斑。奎宿九之魂的编录号是NGC 404,距离我们大约一千万光年远。(Mirach's Ghost 奎宿九之魂){lamp/}原文:{mtitle title="Mirach's Ghost"/}Image Credit &Copyright:Kent WoodExplanation: As far asghosts go, Mirach's Ghost isn't really thatscary.Mirach's Ghost is just a faint, fuzzy galaxy, well known to astronomers,that happens to be seen nearly along the line-of-sight toMirach,a bright star.Centered in this star field,Mirach is also called BetaAndromedae.About 200 light-years distant, Mirach is a redgiant star, cooler than the Sun butmuch larger and so intrinsically much brighter than ourparent star.In most telescopic views, glare anddiffractionspikes tend to hide things that lie near Mirach and make thefaint, fuzzy galaxylook like a ghostly internal reflection of the almostoverwhelming starlight.Still, appearing inthis sharp imagejust above and to the left of Mirach, Mirach's Ghost is cataloged asgalaxy NGC 404and is estimatedto be some 10 million light-years away.
2017年10月27日
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2015-09-26
2015年09月26日:星系M31与M33-(M31 versus M33)
2015年09月26日:星系M31与M33-(M31 versus M33)--原图下载{mtitle title="星系M31与M33"/}Image Credit &Copyright:Malcolm Park(North York Astronomical Association)说明: 在地球天空中分隔约14度─28个满月─的螺旋星系M31(左)和M33,以及我们的银河系,皆是本星系群的大型成员。这幅结合多部窄角及广角相机的组合影像,除了清楚呈现了这两个相邻大星系螺旋臂的细微结构之外,它们也看似以仙女座亮星奎宿九 (Mirach)为平衡点,分落在此星的二侧。只不过,奎宿九离太阳只有200光年远,仙女座大星系M31的距离为2百50万光年,三角座大星系M33约有3百万光年远。虽然M31与M33看来相隔很远,实际上它们以引力互锁进行争战。事实上,电波天文学家找到的线索指出,它们之间可能以一道中性氢气桥相连,为过去曾发生近距离接近的迹证。根据量测和现行的引力模拟预测,银河系、M31和M33之间都会发生近距离接触,在未来数十亿年之间可能会合併。{lamp/}原文:{mtitle title="M31 versus M33"/}Image Credit &Copyright:Malcolm Park(North York Astronomical Association)Explanation: Separated by about 14 degrees(28 Full Moons) in planet Earth's sky,spiral galaxies M31 at left, and M33 are both large members ofthe LocalGroup, along with our own Milky Way galaxy.This narrow- and wide-angle,multi-cameracomposite finds details of spiral structurein both, while the massive neighboring galaxies seem to be balancedin starry fields either side ofbright Mirach, beta star inthe constellation Andromeda.Mirach is just 200 light-years from the Sun.But M31, the Andromeda Galaxy,is really 2.5 million light-years distant andM33, the Triangulum Galaxy, is also about3 million light years away.Although they look far apart, M31 and M33 are engaged in a gravitational struggle.In fact, radio astronomers havefound indications ofa bridge of neutral hydrogen gas that could connect the two,evidence of a closer encounter in the past.Based on measurements, gravitationalsimulations currentlypredict that the Milky Way, M31, and M33will all undergo mutual close encounters and potentiallymergers, billions of yearsin the future.
2015年09月26日
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2013-09-26
2013年09月26日:星系M31与M33-(M31 versus M33)
2013年09月26日:星系M31与M33-(M31 versus M33)--原图下载{mtitle title="星系M31与M33"/}Image Credit &Copyright: Rogelio Bernal Andreo(Deep Sky Colors)说明: 在地球天空中分隔大约14度─28个满月宽度─的螺旋星系M31 (左)和M33,以及我们的银河系,都是本星系群的大型成员。这幅广角望远镜拼接影像,除了呈现了这两个相邻大星系多彩、细緻的螺旋臂结构,它们也看似以仙女座最亮星奎宿九 (Mirach)为平衡点,落在此星的二侧。事实上,仙女座大星系M31的距离为2百50万光年,三角座大星系M33约有3百万光年远,奎宿九距离太阳只有200光年远,近在我们银河系之内,而漂流在影像中的黯淡尘埃云,则位在银盘上方数百光年处。虽然M31与M33看来相隔很远,实际上它们以引力相锁进行拥舞。电波天文学家找到的线索指出,它们之间可能以一道中性氢气桥相连,为过去发生过近距离接近的迹证。根据量测和现行的引力模拟预测,银河系、M31和M33之间都会发生近距离接触,在未来数十亿年之间可能会合併。{lamp/}原文:{mtitle title="M31 versus M33"/}Image Credit &Copyright: Rogelio Bernal Andreo(Deep Sky Colors)Explanation: Separated by about 14 degrees(28 Full Moons) in planet Earth's sky,spiral galaxies M31, left, and M33 are both large members ofthe Local Group,along with our own Milky Way galaxy.This wide-angle,telescopic mosaic captures colorful details of spiral structurein both, while the massive neighboring galaxies seem to be balancedeither side of bright Mirach, beta star in theconstellation Andromeda.But M31, the Andromeda Galaxy,is really 2.5 million light-years distant andM33, the Triangulum Galaxy, is also about3 million light years away.Mirach, just 200 light-years from the Sun,lies well within the Milky Way, along with thedimclouds of dust drifting through the frame only a few hundredlight-years above the galactic plane.Although they look far apart, M31 and M33 are locked in a mutual gravitational embrace.Radio astronomers havefound indications ofa bridge of neutral hydrogen gas that could connect the two,evidence of a closer encounter in the past.Based on measurements, gravitationalsimulations currentlypredict that the Milky Way, M31, and M33will all undergo mutual close encounters and potentiallymergers, billions of yearsin the future.
2013年09月26日
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2010-10-28
2010年10月28日:奎宿九之魂-(Mirach's Ghost)
2010年10月28日:奎宿九之魂-(Mirach's Ghost)--原图下载{mtitle title="奎宿九之魂"/}Credit & Copyright: Anthony Ayiomamitis(TWAN)说明: 以鬼魂的标准来看,奎宿九之魂 (Mirach's Ghost)其实并不吓人。事实上,奎宿九之魂是个天文学家很熟悉的模糊黯淡星系,它只是方位上恰好出现在亮星奎宿九 (Mirach)附近而已。在这张星场影像中央的天体就是奎宿九,它亦名为仙女座β星。离我们大约200光年的奎宿九,是一颗红巨星,表面温度比太阳低,不过体积远比大阳大,也因此其真实亮度也远大于太阳。在大多数的望远镜影像中,奎宿九炫目的星光和它产生的绕射星芒,常遮掩了它附近星野的天体,也让这个黯淡模糊星系,看起像是镜筒内反射所产生的鬼影。不过在这幅清晰影像里,它是位在奎宿九右上方的晕状光斑。奎宿九之魂的编录号是星系NGC 404,离我们约有一千万光年远。{lamp/}原文:{mtitle title="Mirach's Ghost"/}Credit & Copyright: Anthony Ayiomamitis(TWAN)Explanation: As far as ghosts go,Mirach's Ghost isn't really thatscary.In fact,Mirach's Ghost is just a faint,fuzzy galaxy, well known to astronomers,that happens to be seen nearly along the line-of-sight toMirach,a bright star.Centered inthis starfield, Mirach is also called BetaAndromedae.About 200 light-years distant, Mirach is a redgiant star, cooler than the Sun butmuch larger and so intrinsically much brighter than ourparent star.In most telescopic views, glare anddiffractionspikes tend to hide things that lie near Mirach and make thefaint, fuzzy galaxylook like a ghostly internal reflection of the almostoverwhelming starlight.Still, appearingin this sharp image just aboveand to the right of Mirach, Mirach's Ghost is cataloged asgalaxy NGC 404and is estimatedto be some 10 million light-years away.
2010年10月28日
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