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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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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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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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2024-12-29
2024年12月29日:贝加尔湖冻结的甲烷气泡-(Methane Bubbles Frozen in Lake Baikal)
2024年12月29日:贝加尔湖冻结的甲烷气泡-(Methane Bubbles Frozen in Lake Baikal)--原图下载{mtitle title="贝加尔湖冻结的甲烷气泡"/}Image Credit & Copyright: Kristina Makeeva说明: 冻结在贝加尔湖气泡里的是什么?甲烷。 位于俄罗斯的贝加尔湖,是联合国教科文组织 的世界遗址之一,也是世界上体积最大、最古老及最深的湖泊,拥有世界百分之二十以上的淡水储量。这座湖泊也是庞大的甲烷(一种温室气体)储存库,一旦释放出来,可能会造成地球大气对红外光吸收的增加,导至地球平均温度的上升。很幸运的,目前释出的甲烷量,尚未对气候造成重大影响。然而,如果此区的温度大幅上升,或者贝加尔湖的水深显着下降,后果会如何目前仍然不明。影像中的这些气泡,是冬天来临在上浮时,被冻结在这座湖泊无比澄澈的湖冰里。{lamp/}原文:{mtitle title="Methane Bubbles Frozen in Lake Baikal"/}Image Credit & Copyright: Kristina MakeevaExplanation: What are these bubbles frozen into Lake Baikal?Methane. Lake Baikal, a UNESCO World Heritage Site in Russia, is the world's largest (by volume), oldest, and deepest lake, containing over 20% of the world's fresh water.The lake is also a vast storehouse of methane, a greenhouse gas that, if released, could potentially increase the amount of infrared light absorbed by Earth's atmosphere, and so increase the average temperature of the entire planet.Fortunately, the amount of methane currently bubbling out is not climatologically important.It is not clear what would happen, though, were temperatures to significantly increase in the region, or if the water level in Lake Baikal were to drop. Pictured, bubbles of rising methane froze during winter into the exceptionally clear ice covering the lake.
2024年12月29日
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2024-09-06
2024年09月06日:海王星:带环冰质巨行星-(Ringed Ice Giant Neptune)
2024年09月06日:海王星:带环冰质巨行星-(Ringed Ice Giant Neptune)--原图下载{mtitle title="海王星:带环冰质巨行星"/}Image Credit: NASA,ESA,CSA,STScI,NIRCam说明: 在这幅由韦伯太空望远镜所拍摄的清晰近红外光影像里,带环冰质巨行星─海王星位于影像的中心附近。这颗昏暗的天体是离太阳最遥远的行星,与太阳的距离大约为地球的30倍。而在这幅令人讚叹的韦伯影像里,这颗行星之所以会有黝黑幽灵般的外观,则是因为它大气中的甲烷吸收红外光所致。此外,在这幅影像里,伸展到海王星高吸收甲烷上方的高层云清楚可辨。影像中,位在左上方、包裹着氮冰、比海王星要明亮的海王星最大卫星海卫一,周围带着韦伯望远镜特徵性的衍射芒。在这片视野里,包括海卫一在内共可辨认出海王星14颗已知卫星中的7颗。在这张摄于太空的行星新影像里,海王星暗淡的行星环格外引人注目。自1989年8月航行者2号太空船造访海王星以来,这是首次再见到了海王星複杂环系的细节。{lamp/}原文:{mtitle title="Ringed Ice Giant Neptune"/}Image Credit: NASA,ESA,CSA,STScI,NIRCamExplanation: Ringed ice giant Neptunelies near the center of this sharpnear-infrared image from theJames Webb Space Telescope.The dim and distant world is thefarthest planet from the Sun,about 30 times farther away than planet Earth.But in the stunning Webb view, the planet's dark and ghostly appearanceis due to atmospheric methane that absorbs infrared light.High altitude clouds that reach above most of Neptune's absorbing methaneeasily stand out in the image though.Coated with frozen nitrogen, Neptune's largest moon Triton isbrighter than Neptune in reflected sunlight,seen at the upper left sporting the Webb telescope's characteristicdiffraction spikes.Including Triton, seven of Neptune's 14 known moons can beidentifiedin the field of view.Neptune's faint ringsare striking in this space-basedplanetary portrait.Details of the complex ring system are seen here for the firsttime since Neptune was visited by theVoyager 2 spacecraft in August 1989.
2024年09月06日
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2023-10-14
2023年10月14日:日晕环-(Circular Sun Halo)
2023年10月14日:日晕环-(Circular Sun Halo)--原图下载{mtitle title="日晕环"/}Image Credit &Copyright:Vincenzo Mirabella说明: 想看环拱太阳的晕环吗?在世界各地的白昼天空中,它是轻易可见的景观。张角22度、远比彩虹还常见的日晕环,是由薄薄高卷云内随机排列的冰晶所造成的。上面这幅来自手机相机的日晕影像,则是在2021年5月29日摄于义大利的罗马附近。要让明亮的晕环显现,其实只要仔细遮住日盘即可,例如这幅影像里的指尖。晕环的特徵半径,大约与手伸长时,拇指到小指头的手掌张角相当。想看火之环日食吗?这稍难一些。在今天(10月14日)的日食里,名为火之环的精采环食阶段,只有位在通过北美洲、中美洲、及南美洲的狭窄月影带内的住民才得见。不过在更辽阔的美洲区域,可见到日偏食。{lamp/}原文:{mtitle title="Circular Sun Halo"/}Image Credit &Copyright:Vincenzo MirabellaExplanation: Want to see a ring around the Sun?It's easy to doin daytime skies around the world.Created by randomly oriented ice crystals in thin high cirrus clouds,circular 22 degree halos are visible much more often than rainbows.This one wascaptured by smart phonephotographyon May 29, 2021 near Rome, Italy.Carefullyblocking the Sun,for example with a finger tip,is usually all that it takes to reveal the common bright halo ring.The halo's characteristic angular radius is about equalto the span of your hand, thumb to little finger,at the end of your outstretched arm. Want to see aring of fire eclipse?That's harder.The spectacular annular phase oftoday's (October 14) solar eclipse,known as a ring of fire,is briefly visible only when standing alongthe Moon's narrow shadow track that passes over limited parts ofNorth, Central, and South America.The solar eclipse is partial though, when seenfrom broader regions throughout the Americas.
2023年10月14日
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2023-06-10
2023年06月10日:火星与蜂巢星团-(Mars and the Beehive)
2023年06月10日:火星与蜂巢星团-(Mars and the Beehive)--原图下载{mtitle title="火星与蜂巢星团"/}Image Credit &Copyright:Rolando Ligustri说明: 在这个月日落后的西方天空中,明亮的火星及灿烂的金星是其中最醒目的天体。摄于6月3日晚上的这幅影像里,在巨蟹座里漫游的火星正好来到疏散星团M44的群星附近。亘古以来即为人们所知的这个邻近裸眼星团,亦名为鬼宿星团(Praesepe)或蜂巢星团。距离我们只有600光年远的蜂巢星团,其成员星皆远比太阳年轻。而带着淡黄晕光的火星,则大约距离我们17光分。在6月12/13日那晚,金星将接续来到蜂巢星团的群星之旁。不过,金星耀眼的光芒会让蜂巢星团很难用肉眼直接观赏。{lamp/}原文:{mtitle title="Mars and the Beehive"/}Image Credit &Copyright:Rolando LigustriExplanation: This month, bright Mars and brilliant Venusare the prominent celestial beacons inplanet Earth's western skies after sunset.Wandering through the constellation Cancer the Crab, the Red Planet wascaptured hereon the evening of June 3 near the stars ofopen cluster Messier 44.Recognized since antiquity this nearby, naked-eye star cluster is also knownas the Praesepe or the Beehive cluster.A swarm of stars all much younger than the Sun, the Beehive cluster isa mere 600 light-years distant.Seen with a yellowish hue, Mars is about 17 light-minutes away.On June 12/13 Venuswill take its turn posing next to the stars ofthe Beehive cluster.But the dazzling light of Venus will make the Beehive starsdifficult to see by eye alone.
2023年06月10日
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2023-04-30
2023年04月30日:土卫十二的彩色影像-(Saturn's Moon Helene in Color)
2023年04月30日:土卫十二的彩色影像-(Saturn's Moon Helene in Color)--原图下载{mtitle title="土卫十二的彩色影像"/}Image Credit: NASA, JPL-Caltech, SSI;Processing: Daniel Macháček说明: 儘管其颜色或许很平淡,但土卫十二(Helene)不管怎么看都是个谜样的天体。在2012年,当时绕行土星的卡西尼号太空船,俯冲到离这颗娇小卫星不到1个地球直径的距离,并为它拍下了一批上面这种前所未见的细緻影像。而在上面这幅影像里,除了可见到寻常的撞击坑和山丘之外,更记录了看起来异常平滑的带纹原野。行星天文学家正在检视土卫十二的这些细緻影像,一点一滴的收集攸关这座30公里宽漂浮冰山的起源和演变之线索。土卫十二的其他不寻常之处,还有它绕行土星的轨道位置,正好在大卫星土卫四(Dione)的前方,这使它成为现知的4颗、位于名为稳定拉格朗日点(重力井)里的土星卫星之一。{lamp/}原文:{mtitle title="Saturn's Moon Helene in Color"/}Image Credit: NASA, JPL-Caltech, SSI;Processing: Daniel MacháčekExplanation: Although its colors may be subtle, Saturn's moon Helene is an enigma in any light.The moon was imaged in unprecedented detail in 2012 as the robotic Cassini spacecraft orbiting Saturn swooped to within a single Earth diameter of the diminutive moon.Although conventional craters and hills appear, the aboveimage also shows terrain that appears unusually smooth and streaked.Planetary astronomers are inspecting these detailed images of Helene to glean clues about the origin and evolution of the 30-km across floating iceberg.Helene is also unusual because it circles Saturn just ahead of the large moon Dione, making it one of only four known Saturnian moons to occupy a gravitational dimple known as a stable Lagrange point.
2023年04月30日
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2023-03-29
2023年03月29日:SH2-308:海豚状的恆星气泡-(Sh2-308: A Dolphin Shaped Star Bubble)
2023年03月29日:SH2-308:海豚状的恆星气泡-(Sh2-308: A Dolphin Shaped Star Bubble)--原图下载{mtitle title="SH2-308:海豚状的恆星气泡"/}Image Credit & Copyright: Aleix Roig (AstroCatInfo)说明: 是那颗恒星产生了这团气泡?并不是气泡右侧的亮星。同时它也不是一头庞大的太空海豚。造就这个气泡的恒星,是位在这团泛蓝星云中心的活跃沃夫-瑞叶型恒星。沃夫-瑞叶型恒星的质量通常是太阳的20倍以上,能发出高速粒子风形成这类形状具有特徵性的星云。在此案例里,所产生的星云宽度超过60光年,年龄约为70,000年,而形状恰好很像海豚的头部。 这个编录号为Sh2-308、暱称为海豚头星云的团状云气,距离我们约5,000光年远,在天空的张角和满月相当,只是亮度远为暗淡。 在这幅主题影像左侧的泛红云气,其形状及之所会发光,可能也是受到这颗沃夫-瑞叶型恒星辐射的高能星光之塑形及激发。{lamp/}原文:{mtitle title="Sh2-308: A Dolphin Shaped Star Bubble"/}Image Credit & Copyright: Aleix Roig (AstroCatInfo)Explanation: Which star created this bubble?It wasn't the bright star on the bubble's right.And it also wasn't a giant space dolphin.It was the star in the blue nebula's center, a famously energetic Wolf-Rayet star.Wolf-Rayet stars in general have over 20 times the mass of our Sun and expel fast particle winds that can create iconic looking nebulas.In this case, the resulting star bubble spans over 60 light years, is about 70,000 years old, and happens to look like the head of a dolphin. Named Sh2-308 and dubbed the Dolphin-Head Nebula, the gas ball lies about 5,000 light years away and covers as much sky as the full moon -- although it is much dimmer.The nearby red-tinged clouds on the left of the featured image may owe their glow and shape to energetic light emitted from the same Wolf-Rayet star.
2023年03月29日
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