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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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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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2023-11-26
2023年11月26日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)
2023年11月26日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)--原图下载{mtitle title="源自彗星67P表面的尘埃喷流"/}Image Credit: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA说明: 彗星的彗尾来自何处呢?在彗星的彗核上,好像没有会发出喷流形成彗尾的特定位置。不过,在2016年欧洲航天局的罗塞塔号太空船,不但拍摄到一道源自彗星67P/丘泽的喷流,而且还直接穿过它。这幅说服力十足的主题影像,呈现了一道明亮的羽状烟尘,从紧贴着一座10米高墙的圆形凹地喷出。分析罗塞塔号的数据证实,这道喷流的组成是尘埃和水冰。这片崎岖不过很单调的原野显示,产生喷流的源头可能远在多孔的表面之下。这幅影像拍摄的时间点,大约在罗塞塔号进行受控撞击彗星67P表面终结任务的前二个月。{lamp/}原文:{mtitle title="A Dust Jet from the Surface of Comet 67P"/}Image Credit: ESA, Rosetta, MPS, OSIRIS;UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDAExplanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. In 2016, though, ESA's Rosetta spacecraft not only imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew right through it. Featured is a telling picture showing a bright plume emerging from a small circular dip bounded on one side by a 10-meter high wall. Analyses of Rosetta data show that the jet was composed of both dust and water-ice.The rugged but otherwise unremarkable terrain indicates that something likely happened far under the porous surface to create the plume. This image was taken about two months before Rosetta's mission ended with a controlled impact onto Comet 67P's surface.
2023年11月26日
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2023-08-23
2023年08月23日:流星与星系-(The Meteor and the Galaxy)
2023年08月23日:流星与星系-(The Meteor and the Galaxy)--原图下载{mtitle title="流星与星系"/}Credit & Copyright: Jose Pedrero说明: 它来自外太空。此处所谓的“它”,是指沙粒大小的彗核碎片,它可能是绕行太阳的史威福-塔托彗星在多年前喷出来的,然后孤单的持续绕太阳运行。每当地球穿过这个轨道时,彗星碎片就会撞击地球的大气层,成为我们所见的流星。而影像中的这颗流星更发生崩解,所释出的气体受到激发并散发出其组成元素的特徵色泽。这幅主题影像是在上星期摄于西班牙的卡斯提亚-拉曼查自治区,时值英仙流星雨的极大期。美丽的流星痕只出现在为仙女大星系所拍摄的50张照片之一。散布在视野里的每颗恒星,都比流星更远;而与恒星相比,仙女大星系(M31)更加遥远。{lamp/}原文:{mtitle title="The Meteor and the Galaxy"/}Credit & Copyright: Jose PedreroExplanation: It came from outer space.It -- in this case a sand-sized bit of a comet nucleus -- was likely ejected many years ago from Sun-orbiting Comet Swift-Tuttle, but then continued to orbit the Sun alone. When the Earth crossed through this orbit, the piece of comet debris impacted the atmosphere of our fair planet and was seen as a meteor.This meteor deteriorated, causing gases to be emitted that glowed in colors emitted by its component elements.The featured image was taken last week from Castilla La Mancha, Spain, during the peak night of the Perseids meteor shower. The picturesque meteor streak happened to appear in the only one of 50 frames that also included the Andromeda galaxy.Stars dot the frame, each much further away than the meteor.Compared to the stars, the Andromeda galaxy (M31) is, again, much further away.
2023年08月23日
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2021-12-30
2021年12月30日:李奥纳德彗星的超长彗尾-(The Further Tail of Comet Leonard)
2021年12月30日:李奥纳德彗星的超长彗尾-(The Further Tail of Comet Leonard)--原图下载{mtitle title="李奥纳德彗星的超长彗尾"/}Image Credit &Copyright:Daniele Gasparri说明: 这幅12月29日摄于阿塔卡马沙漠幽暗天空下的双图板的影像,主题是2021年最明亮的彗星李奥纳德。往1月3日最近太阳位置前进的李奥纳德彗星,可见的彗尾持续增长。在这幅叠合多张广角照片的影像里(黑白图板用以强化其对比),它形状複杂的离子尾绵延了令人叹为观止的60度视野,而右下方的地平线附近则可见到明亮的木星。从李奥纳德彗星1公里宽、由尘埃、岩石和水冰聚成的彗核蒸发出之物质,形成在阳光中散发萤光的长长离子尾。可能因其彗核有偶发性的爆发,再加上太阳磁场及太阳风的推挤,这颗彗星的彗尾最近数星期出现不规则的窄颈和扭曲。李奥纳德彗星仍要过数天才抵达近日点,因此它的活动预期会持续。目前这颗彗星位在太阳系的黄道面之南,往南天的显微镜座前进。{lamp/}原文:{mtitle title="The Further Tail of Comet Leonard"/}Image Credit &Copyright:Daniele GasparriExplanation: Comet Leonard, brightest comet of 2021,is at the lower left of these two panelscaptured on December 29 in dark Atacama desert skies.Heading for its perihelion on January 3Comet Leonard's visible tailhas grown.Stacked exposures with a wide angle lens(also displayed in a reversed B/W scheme for contrast),trace the complicated ion tail for an amazing 60 degrees, withbright Jupiter shining near the horizon at lower right.Material vaporizingfrom Comet Leonard's nucleus,a mass of dust, rock, and ices about 1 kilometer across,has produced the long tail of ionized gas fluorescing in the sunlight.Likely flares on thecomet's nucleusand buffeting by magnetic fields and the solar wind in recent weekshave resulted in the tail's irregularpinched and twisted appearance.Still days from its closest approach to the Sun,Comet Leonard's activityshould continue.The comet issouth of the Solar System'secliptic plane as it sweeps through the southern constellation Microscopium.
2021年12月30日
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2021-12-08
2021年12月08日:Val Parola隘口上空的海尔-波普彗星-(Comet Hale-Bopp Over Val Parola Pass)
2021年12月08日:Val Parola隘口上空的海尔-波普彗星-(Comet Hale-Bopp Over Val Parola Pass)--原图下载{mtitle title="Val Parola隘口上空的海尔-波普彗星"/}Image Credit & Copyright: A. Dimai, (Col Druscie Obs.),AAC说明: 名为1997年大彗星的海尔-波普,比它周围任何恒星都来得亮,甚至透过明亮的都市灯光都能看见它。而在远离都市灯光的干扰时,它更是一幅不折不扣的奇景。这张摄于义大利.科尔蒂纳丹佩佐镇附近多洛米蒂 山脉的Val Parola隘口之海尔-波普彗星影像,即可为证。影像中,海尔-波普彗星从彗核排出的离子所组成之泛蓝离子尾,受到太阳风的吹拂外指。彗核释出的较大颗粒尘埃,则受到太阳光压的推挤,形成散落在彗星后方轨道上的黄白色尘尾。海尔-波普彗星 (C/1995 O1)肉眼可见的期间长达18个月,冠于信史记录中的任何彗星。这颗大彗星预期会在4385年左右再次回归。在目前的夜空中,李奥纳德彗星不断增亮,或许再过不久肉眼即可见。{lamp/}原文:{mtitle title="Comet Hale-Bopp Over Val Parola Pass"/}Image Credit & Copyright: A. Dimai, (Col Druscie Obs.),AACExplanation: Comet Hale-Bopp,the Great Comet of 1997, became much brighter than any surrounding stars.It was seen even over bright city lights.Away from city lights, however, it put on quite aspectacular show.Here Comet Hale-Bopp was photographed above Val Parola Pass in the Dolomitemountains surroundingCortinad'Ampezzo,Italy.Comet Hale-Bopp'sblue ion tail, consisting ofions from thecomet's nucleus,is pushed out by the solar wind.The whitedust tail is composed of larger particles ofdust from the nucleus driven bythe pressure of sunlight, that orbit behind thecomet.Comet Hale-Bopp (C/1995 O1) remained visible to the unaided eye for 18 months -- longer than any other comet in recorded history.The large comet is next expected to return around the year 4385. This month, Comet Leonard is brightening and may soon become visible to the unaided eye.
2021年12月08日
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2020-07-12
2020年07月12日:丘泽彗星如何产生尘尾-(Comet CG Creates Its Dust Tail)
2020年07月12日:丘泽彗星如何产生尘尾-(Comet CG Creates Its Dust Tail)--原图下载{mtitle title="丘泽彗星如何产生尘尾"/}Image Credit & License: ESA, Rosetta, NAVCAM说明: 彗尾从何而来?在彗核上,最后形成彗尾的喷流,其实并不会源自特定的位置。 彗星喷流的最佳影像之一,可参见2014年到2016年间绕行丘泽彗星(Comet CG)的欧洲航天局.罗塞塔太空船,摄于2015年的这幅主题影像。 这张影像证实,随着丘泽彗星靠近太阳受热,羽状的气体尘埃从难以数计的位置冒出来。 这颗彗星有二个明显分瓣(大者宽度约4公里,小者宽约2.5公里),二者以一道细颈相连。分析指出这种蒸发发生在彗星表面下的深处,最后才以尘埃和冰喷流的形式穿出表面。 丘泽彗星(亦称为67P彗星)在周期6.44年的绕日轨道中,半径大约会缩减1公尺,依这个损耗率来推算,这颗彗星在数千年内就会完全销毁。 在2016年,罗塞塔太空船以受控撞击丘泽彗星表面的方式,终结其任务。{lamp/}原文:{mtitle title="Comet CG Creates Its Dust Tail"/}Image Credit & License: ESA, Rosetta, NAVCAMExplanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. One of the best images of emerging jets is shown in the featured picture, taken in 2015 by ESA's robotic Rosetta spacecraft that orbited Comet 67P/Churyumov-Gerasimenko (Comet CG) from 2014 to 2016. The picture shows plumes of gas and dust escaping numerous places from Comet CG's nucleus as it neared the Sun and heated up. The comet has two prominent lobes, the larger one spanning about 4 kilometers, and a smaller 2.5-kilometer lobe connected by a narrow neck.Analyses indicate that evaporation must be taking place well inside the comet's surface to create the jets of dust and ice that we see emitted through the surface. Comet CG (also known as Comet 67P) loses in jets about a meter of radius during each of its 6.44-year orbits around the Sun, a rate at which will completely destroy the comet in only thousands of years.In 2016, Rosetta's mission ended with a controlled impact onto Comet CG's surface.
2020年07月12日
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2020-01-27
2020年01月27日:蒸发中的丘泽彗星-(Comet CG Evaporates)
2020年01月27日:蒸发中的丘泽彗星-(Comet CG Evaporates)--原图下载{mtitle title="蒸发中的丘泽彗星"/}Image Credit & License: ESA, Rosetta, NAVCAM说明: 彗尾从何而来?在彗核上,最后形成彗尾的喷流,其实并不会源自特定的位置。彗星喷流的最佳影像之一,可参见2014年到2016年间绕行丘泽彗星(Comet CG)的欧洲航天局.罗塞塔太空船,摄于2015年的这幅主题影像。这张影像证实,随着丘泽彗星靠近太阳受热,羽状的气体尘埃从难以数计的位置冒出来。这颗彗星有二个明显分瓣,大者宽度约4公里,较小者宽约2.5公里,二者以一道细颈相连。分析指出这种蒸发发生在彗星表面下的深处,最后才以尘埃和冰喷流的形式穿出表面。丘泽彗星(亦称为67P彗星)在周期6.44年的绕日轨道中,半径大约会缩减1公尺,依这个损耗率来推算,这颗彗星在数千年内就会完全销毁。在2016年,罗塞塔太空船以受控撞击丘泽彗星表面的方式,终结其任务。{lamp/}原文:{mtitle title="Comet CG Evaporates"/}Image Credit & License: ESA, Rosetta, NAVCAMExplanation: Where do comet tails come from? There are no obvious places on the nuclei of comets from which the jets that create comet tails emanate. One of the best images of emerging jets is shown in the featured picture, taken in 2015 by ESA's robotic Rosetta spacecraft that orbited Comet 67P/Churyumov-Gerasimenko (Comet CG) from 2014 to 2016. The picture shows plumes of gas and dust escaping numerous places from Comet CG's nucleus as it neared the Sun and heated up. The comet has two prominent lobes, the larger one spanning about 4 kilometers, and a smaller 2.5-kilometer lobe connected by a narrow neck.Analyses indicate that evaporation must be taking place well inside the comet's surface to create the jets of dust and ice that we see emitted through the surface. Comet CG (also known as Comet 67P) loses in jets about a meter of radius during each of its 6.44-year orbits around the Sun, a rate at which will completely destroy the comet in only thousands of years.In 2016, Rosetta's mission ended with a controlled impact onto Comet CG's surface.
2020年01月27日
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