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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


新年第一颗肉眼可见彗星C/2014 Q2近日现身天宇。天文专家提醒说,一月中旬是观测该彗星的好时机,几乎整夜可见,且受月光干扰影响小。C/2014 Q2是一颗2014年8月发现的新彗星。被发现以来,这颗彗星的亮度迅速上升,一月中旬有望达到4星等,肉眼可见。10日晚,本市天文爱好者马强一行3人在北大港湿地对该彗星进行了观测。“它位于金牛座天区,肉眼看上去有些模糊。拍摄的照片上呈碧绿色,其彗尾清晰可见。”马强说。据新华社电

彗星登陆任务前 罗塞塔号忙里偷闲玩自拍

在经过10年的追寻之后,罗塞塔终于在上月初与67P/Churyumov-Gerasimenko这颗彗星打了个历史性的照面。现在,该航天器已经进入 了环绕彗星的轨道,而航天局的工作人员也圈定了五个预设着陆点。现在正是实现登陆彗星壮举的紧张的准备时刻。而罗塞塔号忙里偷闲借助其搭载的彗星探测器“菲莱”上的红外和可见光分析仪上的摄像头来了一张自拍照,并发回欧洲航天局。


可以看到罗塞塔背后30英里左右就是经过十年追寻的67P/Churyumov-Gerasimenko彗星,而一侧则是罗塞塔上巨大的太阳能电池板,长度约46英尺。这张自拍照是在两个不同的曝光时间拍摄后合成的,以便突出更多细节。所幸的是罗塞塔不会拍嘟嘴照(duck face)。欧洲航天局的工作人员也圈定了五个预设着陆点,正在进行进一步分析,最终的着陆点预计9月15日公布。该彗星的主要成分是冰和岩石,因此要想安全着陆并“下锚”,该任务难度相当的高。


新浪科技讯 北京时间4月1日消息,据国外媒体报道,欧洲空间局(ESA)的彗星探测器“罗塞塔”(Rosetta)项目近日再次迎来里程碑式事件——其搭载的用于在彗星表面登陆的着陆器“菲莱”(Philae)被成功从深度休眠中唤醒。





法国空间局的罗塞塔项目负责人菲利普·戈登(Philippe Gaudon)表示:“在接下来的三周内,我们将对着陆器进行全方位的体检,确保其各方面都情况良好,以便迎接它的大日子。”他说:“到四月的最后一周,我们将完成星上系统的准备工作。在经过5月和6月的测试检验之后,夏天的主要任务就是选择合适的着陆地点。”






这张照片拍摄于2013年11月27日,曝光5分钟,显示ISON彗星的倩影 Continue reading 美宇航局确认ISON彗星已解体死亡