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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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2023-11-13
2023年11月13日:阿尔卑斯山上空的仙女大星系-(Andromeda over the Alps)
2023年11月13日:阿尔卑斯山上空的仙女大星系-(Andromeda over the Alps)--原图下载{mtitle title="阿尔卑斯山上空的仙女大星系"/}Image Credit & Copyright: Dzmitry Kananovich说明: 你看过仙女大星系吗?虽然在肉眼里,M31只是一团暗淡的弥漫光斑,但你所见的光超过2百万年老,因此它可能是你直接可见的最古老星光。这张主题影像,捕捉到去年初悬在瑞士 阿尔卑斯山上空、即将西落的仙女大星系。纵然能以肉眼观赏银河系的邻居星系是很酷的事,但长曝光的相机照片,更能记录诸多暗淡而动人的细节。这幅影像是由同一部相机连续拍摄的多张前景与背景照片组合而成。近来的数据指出,我们的银河系在未来的数十亿年之中,将和较大的仙女大星系互撞及合併。{lamp/}原文:{mtitle title="Andromeda over the Alps"/}Image Credit & Copyright: Dzmitry KananovichExplanation: Have you ever seen the Andromeda galaxy?Although M31 appears as a faint and fuzzy blob to the unaided eye, the light you see will be over two million years old, making it likely the oldest light you ever will see directly.The featured image captured Andromeda just before it set behind the Swiss Alps early last year.As cool as it may be to see this neighboring galaxy to our Milky Way with your own eyes, long duration camera exposures can pick up many faint and breathtaking details.The image is composite of foreground and background images taken consecutively with the same camera and from the same location. Recent data indicate that our Milky Way Galaxy will collide and coalesce with Andromeda galaxy in a few billion years.
2023年11月13日
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2019-02-19
2019年02月19日:螺旋星系NGC 2903前方的岩本彗星-(Comet Iwamoto Before Spiral Galaxy NGC 2903)
2019年02月19日:螺旋星系NGC 2903前方的岩本彗星-(Comet Iwamoto Before Spiral Galaxy NGC 2903)--原图下载2019 February 19 {mtitle title="螺旋星系NGC 2903前方的岩本彗星"/}Video Credit & Copyright: Norbert Span说明: 彗星并不是每晚都会掠过星系。不过在上星期二,双筒望远镜可见的彗星C/2018 Y1(岩本),几乎正好通过亮度相近的螺旋星系NGC 2903之前方。发现于去年底的岩本彗星,绕行太阳的轨道是很扁的椭圆,它上次造访太阳系内围是在中世纪的648年左右。这颗彗星于2月6日,运行到位在火星与地球之间的的近日点,然后在2月13日抵达最靠近地球的位置。这部上星期摄于瑞士的主题影片,把将近3小时的运动浓缩成10秒。在那时,拥有泛绿彗发的岩本彗星,距离我们约10光分,而螺旋星系NGC 2903 的距离则一直保持在3千万光年左右。在影片的3分之1处,可见到2颗人造卫星斜贯过视野。通常每年都会出现数颗亮度和岩本彗星相近的彗星。{lamp/}原文:{mtitle title="Comet Iwamoto Before Spiral Galaxy NGC 2903"/}Video Credit & Copyright: Norbert SpanExplanation: It isn't every night that a comet passes a galaxy.Last Thursday, though, binocular comet C/2018 Y1 (Iwamoto) moved nearly in front of a spiral galaxy of approximately the same brightness: NGC 2903.Comet Iwamoto was discovered late last year and orbits the Sun in a long ellipse.It last visited the inner Solar System during the Middle Ages, around the year 648.The comet reached its closest point to the Sun -- between Earth and Mars -- on February 6, and its closest point to Earth a few days ago, on February 13.The featured time-lapse video condenses almost three hours into about ten seconds, and was captured last week from Switzerland.At that time Comet Iwamoto, sporting a green coma, was about 10 light minutes distant, while spiral galaxy NGC 2903 remained about 30 million light years away. Two satellites zip diagonally through the field about a third of the way through the video. Typically, a few comets each year become as bright as Comet Iwamoto.
2019年02月19日
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2019-02-12
2019年02月12日:飞机偶遇蛾眉月-(Plane Crossing a Crescent Moon)
2019年02月12日:飞机偶遇蛾眉月-(Plane Crossing a Crescent Moon)--原图下载{mtitle title="飞机偶遇蛾眉月"/}Image Credit & Copyright: Olivier Staiger(Binounistan.com)说明: 这当然不是飞往月球的可行方式。影像所呈现的,只是飞机和月亮的意外叠合。飞机凝结尾的色泽通常泛白,不过在此例里,落日方向的大量空气,滤除了阳光中的蓝光,让凝结尾在红化阳光的照射下,带着亮红的色泽。除此之外,位在飞机后方远处的蛾眉月,色泽也稍微偏红。这幅一个月前摄于瑞士.瓦莱州的主题影像,拍摄的时间紧在日落之后,因此,飞机及凝结尾都还沐浴在阳光里。让人惋惜的是,只过了数分钟,这场即兴的天空秀就落幕了。飞机首先越过月盘远颷消失在天际,接着月沉西山,然后夜幕升起,凝结尾变暗消散。{lamp/}原文:{mtitle title="Plane Crossing a Crescent Moon"/}Image Credit & Copyright: Olivier Staiger(Binounistan.com)Explanation: No, this is not a good way to get to the Moon.What is pictured is a chance superposition of an airplane and the Moon.The contrail would normally appear white, but the large volume of air toward the setting Sun preferentially knocks away blue light, giving the reflected trail a bright red hue. Far in the distance, well behind the plane, is a crescent Moon, also slightly reddened. Captured a month ago above Valais, Switzerland, the featured image was taken so soon after sunset that planes in the sky were still in sunlight, as were their contrails.Within minutes, unfortunately, the impromptu sky show ended. The plane crossed the Moon and moved out of sight. The Moon set. The contrail became unilluminated and then dispersed.
2019年02月12日
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2013-04-23
2013年04月23日:超新星残骸SN 1006的X射线影像-(X-rays from Supernova Remnant SN 1006)
2013年04月23日:超新星残骸SN 1006的X射线影像-(X-rays from Supernova Remnant SN 1006)--原图下载{mtitle title="超新星残骸SN 1006的X射线影像"/}Image Credit: NASA/CXC/P. Frank Winkler (Middlebury College)说明: 人类的历史纪录里,这个像泡芙球的天体无疑是明亮超新星爆发后的残骸。西元1006年,中国、埃及、伊拉克、义大利、日本、瑞士的历史都有记载,夜空中一颗新出现的亮星。南天星座豺狼座内,能发现这恒星爆炸遗留下的残骸云气仍在扩张,从电磁波光谱能看见它所发出的宇宙辉光。这张影像实际上是使用钱卓拉X射线天文台拍摄的X射线影像做三色合成得到的结果。超新星残骸SN 1006的残骸云气,其直径约60光年,是白矮星爆发后留下的产物。在部分双星系统中,緻密的白矮星会渐渐地从伴星吸积物质。最后,质量的增长触发了热核爆,摧毁这颗矮星。因为超新星残骸与地球的距离约7000光年,所以西元1006年的超新星爆发实际发生在当时的7000年以前。残骸里的冲击波加速周围粒子到极高能量,且推测它可能是神秘宇宙射线的来源之一。{lamp/}原文:{mtitle title="X-rays from Supernova Remnant SN 1006"/}Image Credit: NASA/CXC/P. Frank Winkler (Middlebury College)Explanation: What looks like a puff-ball is surely the remains of the brightest supernova in recorded human history.In 1006 AD, it was recorded as lighting up the nighttime skies above areas now known as China, Egypt, Iraq, Italy, Japan, and Switzerland.The expanding debris cloud from the stellar explosion,found in the southerly constellation the Wolf(Lupus),still puts on a cosmic light show across theelectromagnetic spectrum.In fact, the aboveimage results from three colors of X-rays taken by the orbiting Chandra X-ray Observatory.Now known as the SN 1006 supernova remnant, the debris cloudappears to be about 60 light-years across and is understoodto represent the remains of a white dwarf star.Part of a binary star system,the compact white dwarf graduallycaptured material from its companion star.The buildup in mass finally triggered athermonuclear explosion that destroyed the dwarf star.Because the distance to the supernova remnant is about 7,000light-years, that explosion actuallyhappened 7,000 years before the light reached Earth in 1006.Shockwaves in the remnantaccelerateparticles to extreme energies and arethought to be a source of the mysteriouscosmic rays.
2013年04月23日
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2012-12-18
2012年12月18日:瑞士上空的太阳光柱-(A Sun Pillar Over Sweden)
2012年12月18日:瑞士上空的太阳光柱-(A Sun Pillar Over Sweden)--原图下载{mtitle title="瑞士上空的太阳光柱"/}Image Credit & Copyright: G�ran Strand说明: 你有看过太阳光柱吗?日出或日落之时,在冰冷的空气中,从高空落下的冰晶反射太阳光,产生这罕见的光柱景象。从高层云落下的冰晶形状通常是扁平六角形,受到空气阻力的影响,这种冰晶在落地前,大部份的时间都是打平的飘下。当阳光被恰好排列整齐的冰晶反射,就会产生这种太阳光柱。这张照片是上週在瑞士 厄斯特松德市拍摄的,反射日落时刻的光线而产生的太阳光柱。{lamp/}原文:{mtitle title="A Sun Pillar Over Sweden"/}Image Credit & Copyright: G�ran StrandExplanation: Have you ever seen a sun pillar? When the air is cold and the Sun is rising or setting, falling icecrystals can reflect sunlight and create an unusual column of light. Ice sometimes forms flat, six-sidedshaped crystals as it falls from high-levelclouds. Air resistance causes these crystals to lie nearly flat much of the time as they flutter to the ground. Sunlight reflects off crystals that are properly aligned, creating the sun-pillar effect. In the above picture taken last week, a sun-pillar reflects light from a Sun setting over �stersund,Sweden.
2012年12月18日
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2011-02-21
2011年02月21日:瑞士的银河-(Milky Way Over Switzerland)
[2011年02月21日:瑞士的银河-(Milky Way Over Switzerland)--原图下载](https://apod.nasa.gov/apod/image/1102/mwcliffs_vetter_2000.jpg"onMouseOver="if (document.images)document.imagename1.src='image/1102/mwcliffs_vetter_annotated_900.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/1102/mwcliffs_vetter_900.jpg';){mtitle title="瑞士的银河"/}Credit: Stephane Vetter(Nuits sacrees)说明: 这期间可以在夜空中看见甚么?为了解答这个疑惑,本月初在瑞士Neuchâtel拍下美丽的土地、云彩与星野。前景中可见白雪覆盖的U型大峭壁Creux du Van、伴随着远方树林与城市灯火所照亮的云彩,在夜空中,午夜可见的星系包含了中心的拱型光带,这是我们银河系的中央盘面,其他可见星系是仙女座大星系(M31)以及三角座星系(M33)。星团则是包含了NGC 752、M34、M35、M41、双星团、以及蜂窝星团(M44)。可见星云有猎户座星云(M42)、NGC 7822、IC 1396、以及玫瑰星云与火焰星云、加州星云、心脏星云以及魂魄星云、以及小精灵星云。移动你的滑鼠到影像上,可见这些星云星团的标籤。在这广视野影像中的夜空显得更加辽阔,你是否还能从这影像中辨认出其他的星云呢?{lamp/}原文:{mtitle title="Milky Way Over Switzerland"/}Credit: Stephane Vetter(Nuits sacrees)Explanation: What's visible in the night sky during this time of year?To help illustrate the answer, a beautiful land, cloud, and skyscape was captured earlier this month overNeuch�tel,Switzerland.Visible in the foreground were the snow covered cliffs of the amphitheater shapedCreux du Van, as well as distant trees, and town-lit clouds.Visible in the night sky (at midnight) were galaxies including thelong arch of the central band of ourMilky Way Galaxy, theAndromeda galaxy (M31), and theTriangulum galaxy(M33).Star clusters visible included NGC 752,M34,M35,M41,the double cluster, andthe Beehive (M44).Nebulas visible included the Orion Nebula(M42),NGC 7822,IC 1396, theRosette Nebula,the Flaming Star Nebula, theCalifornia Nebula, theHeart andSoul Nebulas, and thePacman Nebula.Rolling your cursor over theabove image will bring up labels for all of these.But the abovewide angle sky image captured even more sky wonders.What other nebulascan you find in the above image?
2011年02月21日
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