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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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2017-07-23
2017年07月23日:信使号所拍摄的水星-(Mercury as Revealed by MESSENGER)
2017年07月23日:信使号所拍摄的水星-(Mercury as Revealed by MESSENGER)--原图下载{mtitle title="信使号所拍摄的水星"/}Image Credit: MESSENGER,NASA,JHU APL, CIW说明: 这是前所未见的水星。在2008年,无人的信使号太空船第二次掠过水星,并且拍下了先前只有相对粗糙地面雷达影像的区域之影像。在这张由信使号在通过90分钟后转头从27,000公里之外所拍下的主题影像里,可见到许多第一次看到的表面特徵,包括从临边一个年轻撞击坑射出、形似经度 子午线的不寻常颀长辐线。信使号在2011年入轨水星,并在2012年结束主要任务,不过一直进行细部观测到2015年,当它耗尽燃料接到指令撞击水星表面方止。{lamp/}原文:{mtitle title="Mercury as Revealed by MESSENGER"/}Image Credit: MESSENGER,NASA,JHU APL, CIWExplanation: Mercury had never been seen like this before. In 2008, the robotic MESSENGER spacecraft buzzed past Mercury for the second time and imaged terrain mapped previously only by comparatively crude radar. The featured image was recorded as MESSENGER looked back 90 minutes after passing, from an altitude of about 27,000 kilometers.Visible in the image, among many other newly imaged features, are unusually long rays that appear to run like meridians of longitude out from a young crater near the northern limb. MESSENGER entered orbit around Mercury in 2011 and finished its primary mission in 2012, but took detailed measurements until 2015, at which time it ran out of fuel and so was instructed to impact Mercury's surface.
2017年07月23日
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2011-12-05
2011年12月05日:在挪威的难忘极光-(A Memorable Aurora Over Norway)
2011年12月05日:在挪威的难忘极光-(A Memorable Aurora Over Norway)--原图下载{mtitle title="在挪威的难忘极光"/}Image Credit & Copyright: OleChristian Salomonsen说明: 本季最让人难忘的极光。绿色、红色、还有红绿交杂的光芒,可见多样的光线,一幕幕,甚至是冕状极光。背景中数也数不清的恒星、前景熟悉的景色。这样的画面是上个月透过鱼眼镜头,拍摄于挪威的Tromsø。未来太阳活动将愈来愈活跃,明年将可能会上演更壮观的极光。{lamp/}原文:{mtitle title="A Memorable Aurora Over Norway"/}Image Credit & Copyright: OleChristian SalomonsenExplanation: It was one of the most memorable auroras of the season.There wasgreen light, redlight, and sometimes a mixture of the two.There were multiplerays,distinct curtains, and even anauroral corona.It took up so much of the sky.In thebackground were starstoo numerous to count, in the foreground a friendtrying to image the same sight.The scenewas captured with a fisheye lens around and aboveTromsø,Norway, last month. With the Sun becoming moreactive, next year might bring even morespectacular aurora.
2011年12月05日
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2010-03-15
2010年03月15日:希腊上空的云迹-(Illuminated Cloud Trails Above Greece)
2010年03月15日:希腊上空的云迹-(Illuminated Cloud Trails Above Greece)--原图下载{mtitle title="希腊上空的云迹"/}Credit & Copyright: Chris Kotsiopoulos说明: 这张看似白天的影像,其实是晚上所拍摄的。奇妙的橘色辐条从太阳方向射出,其实是月光从遥远的地平线照亮了薄云,远方薄云看似一层一层的,则是一些简单的云系透过多次曝光所形成的结果。这张时间序列影像大概持续了两小时,是两週前在希腊的桑尼奥所拍摄的。这些星迹围绕着在右上方的北极星,在前方看似着名的古建筑又是谁呢?原来是建造于上个世纪的荒废小教堂。{lamp/}原文:{mtitle title="Illuminated Cloud Trails Above Greece"/}Credit & Copyright: Chris KotsiopoulosExplanation: It may appear to be day, but it's night. Those wondrous orange streaks may appear to berays from the setting Sun,but they're actually thin cloudsilluminated by the Moonas they quickly streaked toward the distant horizon.The thick clouds on the far left may appear to have many layers,but actually they are just a fewsimple clouds captured on numerous separate exposures. What is surely true, though, is that theabove time lapse image sequence was taken over two hours,about two weeks ago, inSounio,Greece. Also, those really are star trails swirling around the north starPolarison the upper right of the image. But what about the building in the foreground? It may appear to be a famous ancient structure, but it's actually a small deserted church built only last century.
2010年03月15日
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2008-10-08
2008年10月08日:信使号眼中的水星-(Mercury as Revealed by MESSENGER)
2008年10月08日:信使号眼中的水星-(Mercury as Revealed by MESSENGER)--原图下载{mtitle title="信使号眼中的水星"/}Credit: MESSENGER,NASA,JHU APL, CIW说明: 科学家很早就开始探测这个位在太阳系最内侧的行星-水星,却是第一次拍摄到水星的这一面。信使号太空船(MESSENGER spacecraft)两天前又再一次的掠过水星(第二次),并且拍下过去只有从低解析度雷达纪录的地区。信使号在距水星高度27,000公里处,回头拍摄水星90分钟才得到上面这张崭新的影像,并且发现有不寻常的辐射状特徵,如地球经度线一般由中心向北延伸。信使号将会再次掠过水星,于2011年由火箭推进至其轨道上,正式开始绕行水星的观测。{lamp/}原文:{mtitle title="Mercury as Revealed by MESSENGER"/}Credit: MESSENGER,NASA,JHU APL, CIWExplanation: The planet Mercury has been known since history has been recorded, but parts of the Solar System's innermost planet have never been seen like this before. Two days ago the robotic MESSENGER spacecraft buzzed past Mercury for the second time and imaged terrain mapped previously only by comparatively crude radar. The above image was recorded as MESSENGER looked back 90 minutes after passing, from an altitude of about 27,000 kilometers.Visible in the above image, among many other newly imaged features, are unusually long rays that appear to run like meridians of longitude out from a young crater near the northern limb. MESSENGER is scheduled to fly past Mercury once more before firing its thrusters to enter orbit in 2011.
2008年10月08日
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2008-02-04
2008年02月04日:水星上蜘蛛状的陨石坑-(A Spider Shaped Crater on Mercury)
2008年02月04日:水星上蜘蛛状的陨石坑-(A Spider Shaped Crater on Mercury)--原图下载{mtitle title="水星上蜘蛛状的陨石坑"/}Credit: MESSENGER,NASA,JHU APL, CIW说明: 为何水星上的这个陨石坑看起来会像只蜘蛛呢?当信使号太空船上个月飞过水星时,它看到了这颗离太阳最近的行星表面上,人们从来没看过的部份。当拍摄水星巨大的卡洛里斯盆地(Caloris Basin)时,信使号发现了一个拥有辐射状的条纹,由中心向外放射的陨石坑,如上图。像这样位于谷底的陨石坑以前从未在太阳系之中看到过。唯一不明白的,是陨石坑和辐射线之间的关係。有可能是陨石坑产生了这些辐射线条,也有可能两者只是刚好发生在同一个地方,这当然是将来的研究课题之一。在2011年发射火推进器,进入水星轨道之前,信使号预计将会再飞掠水星两次。{lamp/}原文:{mtitle title="A Spider Shaped Crater on Mercury"/}Credit: MESSENGER,NASA,JHU APL, CIWExplanation: Why does this crater on Mercury look like a spider? When the robotic MESSENGER spacecraft glided by the planet Mercury last month, it was able to image portions of the Sun's closest planet that had never been seen before.When imaging the center of Mercury's extremely large Caloris Basin, MESSENGER found a crater, pictured above, with a set of unusual rays emanating out from its center. A crater with such troughs has never been seen before anywhere in our Solar System.What isn't clear is the relation of the crater to the radial troughs.Perhaps the crater created the radial rays, or perhaps the two features appear only by a chance superposition -- the topic is sure to be one of future research.MESSENGER is scheduled to fly past Mercury twice more before firing its thrusters to enter orbit in 2011.
2008年02月04日
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2008-01-01
2008年01月01日:-(Rays from an Unexpected Aurora)
2008年01月01日:-(Rays from an Unexpected Aurora)--原图下载{mtitle title=""/}Credit & Copyright: Lyndon Anderson (Prairie Journal)说明: 这个极光来得有些意外。 2002年的这个日子,并未预期会有很强的极光活动。 但更令人意外的也许是,在某些地区,看见了这个带着绿色线状结构的极光。 在这张于美国 北达克达州所拍摄的影像里,可以见到绿色栅栏状绿色极光,一直延伸向远方的地平线。 与绿色线状结构争辉的是一道很不寻常的红色带状极光。来自附近俾斯麦市和曼丹市的灯光,照亮了地平面附近的天空。 注: 每日一天文图的德文站已经开站了。 明日的图片: pixels in space{lamp/}原文:{mtitle title="Rays from an Unexpected Aurora"/}Credit & Copyright: Lyndon Anderson (Prairie Journal)Explanation: This aurora was a bit of a surprise. For starters, on this day in 2002, no intense auroral activity wasexpected at all. Possibly more surprising, however, the aurora appeared to show an usual structure of green rays from some locations. Inthis view, captured from North Dakota, USA, a picket fence of green rays stretches towardthe horizon. Mirroring the green rays is a red band, somewhat rare in its own right. Lights from the cities of Bismarck and Mandan are visible near the horizon.
2008年01月01日
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