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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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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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2017-11-06
2017年11月06日:源自彗星67P表面的尘埃喷流-(A Dust Jet from the Surface of Comet 67P)
2017年11月06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 & Copyright: 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,在去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。这片单调的原野指出,产生喷流的源头可能远在多孔的表面之下。这幅影像摄于去年7月,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 & Copyright: 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. Last year, 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 shows that the jet was composed of both dust and water-ice.The mundane terrain indicates that something likely happened far under the porous surface to create the plume. This image was taken last July, about two months before Rosetta's mission ended with a controlled impact onto Comet 67P's surface.
2017年11月06日
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