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2400年后的一颗彗星会造访地球 或威胁人类












失联彗星探测器被找回 将继续执行探测任务







暗能量相机拍到绿色大彗星 距地球8200万公里






亚利桑那大学的天文学家在《自然》期刊上发表了一篇论文,报告首次观测到 正在形成中的行星。至今确认的一千多颗系外行星没有一颗处于形成之中。研究人员利用自适应光学系统对一颗行星产生的光的观测显示它正处于形成之中。他们观 测的是金牛星座的一个恒星系统LkCa 15,观测显示它可能有三颗行星,其中一颗LkCa 15 b是一个强大的氢a发射体,证实它正在形成之中。



另外两颗LkCa 15c和d则没有那么强。LkCa 15 b被认为正处于吸积过程,对其磁场强度的估计认为它的磁场是今天木星磁场的至少20倍。





彗 星是太阳系中冰冷的小天体,当它足够接近太阳的时候就会显示出可见的彗发(稀薄、模糊、暂时的大气层)和彗尾。这种现象是由于太阳辐射压和太阳风对彗核的 共同作用。I、离子尾是由于太阳的紫外线把彗星的物质电离,离子在太阳风的作用下完全指向朝向太阳相反的方向;II、尘埃尾是相对较大的颗粒在太阳光压的 作用下形成的。尘埃尾和离子尾稍微指向不同的方向。

彗星的形状不是千篇一律的,1744年出现的歇索彗星,就有六条尾巴,它横亘天空,展开 44度,就像一把大扇子;1976年3月初,我国东部地区见到的一颗彗星,尾巴就像白孔雀开屏,从海南岛到黑龙江都能看到它。谈到彗星的体积,太阳系里随 便哪一颗行星,都无法与大彗星作比较,着名的哈雷彗星,它的彗发部分直径就有57万公里。有记录的最大彗星,彗发部分直径达185万公里,至于彗尾的长 度,最大的,从头到尾竟长达几亿公里。

无人探测器传回彗星近照 一片洪荒





无人探测器传回彗星近照 一片洪荒

无人探测器传回彗星近照 一片洪荒

无人探测器传回彗星近照 一片洪荒

无人探测器传回彗星近照 一片洪荒

太阳系外发现奇特行星 带有彗星“小尾巴”

据国外媒体报道,天文学家近日发现了一颗距离太阳系153光年远的太阳系外行星HD 209458b。据观察,这颗行星与彗星一样大,具有一个神奇的类似彗星慧尾的“小尾巴”,同时这颗行星近距离的围绕着它的起源星球旋转。

  太阳系外行星HD 209458b围绕着它的起源星球旋转,并且带有一条如彗星上的 “小尾巴”

  天文学家观察到这颗行星周围的大气被大量的推入到空间内,以至于产生了一条类似彗星慧尾的 “小尾巴”。在2003年时,科学家就怀疑恒星风过强的风力很可能会将行星周围的大气扫进空间中。科学家杰弗里·林斯基(Jeffrey Linsky)表示,他们测量到与这个行星分离的气体,正在以一种特别快的速度朝向地球的方向流去,同时还测量到紧随其后的一些物质的速度。这个巨大气体流很可能是被恒星风从行星HD 209458b旁吹散的。

  据了解,行星HD 209458b是迄今为止发现的第一个围绕自己的起源星球旋转的太阳系外行星。天文学家表示,行星HD 209458b的公转周期十分短,它的一年相当于地球上的3.5天。当行星处于起源星球前面时,它1.5%的光就会被起源星球遮挡住,另外周围的大气还会挡住一些光。如果加上大气对光的遮挡,那么最后这颗行星发出的光就会减少到8%。



100_0675e 日本宇宙航空研究开发机构(JAXA)27日表示,日本将于5月发射一艘“太空帆船”,可利用风筝形太阳帆反弹太阳粒子向前推进。“太空帆船”名为 “伊卡洛斯”(太阳辐射推进型行星际风筝飞船的英文缩写),将于5月18日搭乘火箭在日本南部的种子岛航天中心发射升空。6个月的飞行任务目标将是金星,如果飞行成功,日本还计划进一步的探索,包括木星和特洛伊银河体系。






太空政策战略总部的一名官员27日表示,一个专家小组建议日本政府在未来5年向月球派遣一个有轮机器人,并在2020年之前建造世界上第一个月球基地。专家小组最初曾考虑派遣一个两足类人机器人,但最终还是认定有轮机器人更为实用。 据《信息时报》













韩开发出探月飞船火箭发动机 计划2020年前探月

韩国科学技术院(KAIST)4月29日称,由该院航空宇宙工程系全世镇(音译)教授率领的研究小组与宇宙解决方案公司(Space Solution)联手,成功开发出探月飞船的液体火箭发动机。
韩国政府曾于 2007年底表示,韩国计划于2020年前利用本国技术发射首个绕月探测器,加入亚洲国家探月行列。绕月探测器发射计划是韩国政府“太空发展路线图”一部分,如果第一个绕月探测器发射成功,韩国计划于2025年发射第一个能够登陆月球表面的月球探测器。