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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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2023-02-25
2023年02月25日:眉月掩木星-(Crescent Moon Occultation)
2023年02月25日:眉月掩木星-(Crescent Moon Occultation)--原图下载{mtitle title="眉月掩木星"/}Image Credit &Copyright: Fefo Bouvier说明: 2月22日的日落时分,上弦月与黄道面上的明亮金星及木星共享西方天空。虽然全球各地皆可见到这片美丽天体近合的景观。但是从某些地方看出去,蛾眉月掩木星,让它消失在月盘后方一段时间。在上面这幅摄于乌拉圭.科洛尼亚-德尔萨克拉门托市的影像里,悬在拉普拉塔河上空的太阳系最大的气态巨行星-木星,即将消失在月亮黝黑的月盘后方。在这片静谧的河流和天空景观里,金星大放光芒,它明亮的身影沈浸在地平线附近的渐暗暮光中。在下星期,傍晚天空中的金星和木星会靠得更近。{lamp/}原文:{mtitle title="Crescent Moon Occultation"/}Image Credit &Copyright: Fefo BouvierExplanation: On February 22, a young Moon shared the western sky at sunsetwith bright planets Venus and Jupiteralong the ecliptic plane.The beautiful celestial conjunction wasvisible around planet Earth.But from somelocationsJupiter hid for a while,occulted by the crescent lunar disk.The Solar System's ruling gas giant was captured here justbefore it disappeared behind the Moon's dark edge,seen overthe Río de la Plata at Colonia del Sacramento, Uruguay. In the serene river and skyscape Venus is not so shy,shining brightly closer to the horizonthrough the fading twilight.Next week Venus and Jupiter will appeareven closerin your evening sky.
2023年02月25日
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2022-08-19
2022年08月19日:土星:1993年-2022年-(Saturn: 1993 - 2022)
2022年08月19日:土星:1993年-2022年-(Saturn: 1993 - 2022)--原图下载{mtitle title="土星:1993年-2022年"/}Image Credit &Copyright: Tunc Tezel(TWAN)说明: 土星是太阳系里肉眼轻易可见的最遥远行星。在这个起始于1993年的非凡长期天文成像计划里,你可以追随这颗带环的气态巨行星,游蕩于黄道面上,截自2022年,在一个土星年里绕行太阳一圈的行蹤。这幅建构自摄于29个地球年的照片之全景图,以黄道为中心分隔上下,并与我们银河系的盘面交会。1993年的土星,位在上图板右侧的摩羯座之内,然后不断向左移动,并在2022年回到下图板左侧的摩羯座里。在这幅成像参数均一的影像里,土星在2000-2005年和2015-2019年期间,看来较为明亮,这是因为该时它美丽的环系向地球倾斜。{lamp/}原文:{mtitle title="Saturn: 1993 - 2022"/}Image Credit &Copyright: Tunc Tezel(TWAN)Explanation: Saturn is the most distant planetof the Solar Systemeasily visibleto the unaided eye.With this extraordinary, long-term astro-imaging project begun in 1993,you can follow the ringed gas giant for one Saturn yearas it wandersonce around theecliptic plane,finishing a single orbit around the Sun by 2022.Constructed from individual images made over 29 Earth years,the split panorama is centered along the eclipticand crossed by the plane of our Milky Way galaxy.Saturn's position in 1993 is at the right side, upper panelin the constellationCapricornus and progresses toward the left.It returns to the spot in Capricornusat left in the lower panel in 2022.The consistent imaging shows Saturn appears slightly brighter during the years2000-2005 and 2015-2019, periods when its beautiful rings weretilted more face-on to planet Earth.
2022年08月19日
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2022-04-09
2022年04月09日:火星与土星的近合-(Mars-Saturn Conjunction)
2022年04月09日:火星与土星的近合-(Mars-Saturn Conjunction)--原图下载{mtitle title="火星与土星的近合"/}Image Credit &Copyright:Damian Peach说明: 在这片视野中,黄道星座.摩羯座里的较昏暗恒星散布在黄道面附近。不过,影像中心那二颗最亮的天体并不是恒星,而是火星与土星。这幅摄于4月4日清晨的望远镜影像,记录在黎明前的天空,这对行星以约1/3度(小于满月视张角)的间隔发生迷人的近合景象。你能分辨出那颗行星是那个吗?如果你猜火星是较红的那颗,你猜对了。位于火星上方稍暗一点的土星,在反射阳光后散发出淡黄的光芒。即便在低放大倍率下,仍可见到土星最大及最明亮的卫星土卫六,紧贴在土星的左侧。{lamp/}原文:{mtitle title="Mars-Saturn Conjunction"/}Image Credit &Copyright:Damian PeachExplanation: Fainter stars in the zodiacal constellation Capricornus arescattered near the plane ofthe eclipticin this field of view.The two brightest ones at center aren't stars at all though, butthe planets Mars and Saturn.Taken on the morning of April 4, thetelescopic snapshotcaptured their tantalizingclose conjunctionin a predawn sky, the pair of planets separatedby only about 1/3 of a degree.That's easily less than the apparent width of a Full Moon.Can you tell which planet is which?If you guessed Mars is the redder one , you'd be right.Above Mars, slightly fainter Saturn still shines with apaler yellowish tinge inreflected sunlight. Even at the low magnification, Saturn's largest and brightestmoon Titan can be spotted hugging the planet very closely on the left.
2022年04月09日
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2021-05-12
2021年05月12日:流星与对日照-(A Meteor and the Gegenschein)
[2021年05月12日:流星与对日照-(A Meteor and the Gegenschein)--原图下载](https://apod.nasa.gov/apod/image/2105/GegenscheinBolide_Casado_2500.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2105/GegenscheinBolide_Casado_1080_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2105/GegenscheinBolide_Casado_1080.jpg';){mtitle title="流星与对日照"/}Image Credit: J.C. Casado, StarryEarth, EELabs, TWAN说明: 与太阳反向的夜空最黝黑吗?非也!事实上,在极幽暗的夜空中,与太阳相隔180度的方向,可以看到称为对日照的微弱辉光。对日照是阳光被行星际尘埃粒子反向散射所造成的景观。而这些位在黄道面上,大小只有几毫米的尘埃粒子,则是从小行星裂解出来的碎片。上面这张摄于去年3月的照片,是有史以来最引人注目的对日照影像之一。这张摄于西班牙.加那利群岛的深空影像,呈现在泰德天文台上方极幽暗的夜空中,沈浸在大範围黄道光里的对日照。在影像背景里,较醒目的天体有火流星(左侧)、北斗七星(右上角)、和北极星(右缘)。这颗流星看似直冲西班牙最高的泰德峰而去,而右侧的建物为金字塔太阳实验室。白昼时,在飞机上常可见到和太阳反向的空气或云反射阳光,形成和对日照相类似的宝光现象。 (gegenschein 对日照;德文意为"对面的辉光"){lamp/}原文:{mtitle title="A Meteor and the Gegenschein"/}Image Credit: J.C. Casado, StarryEarth, EELabs, TWANExplanation: Is the night sky darkest in the direction opposite the Sun?No. In fact, a rarely discernable faint glow known as the gegenschein (German for "counter glow") can be seen 180 degrees around from the Sun in an extremely dark sky.The gegenschein is sunlight back-scattered off small interplanetarydust particles. These dust particles are millimeter sized splinters from asteroids and orbit in the ecliptic plane of the planets. Pictured here from last March is one of the more spectacular pictures of the gegenschein yet taken.The deep exposure of an extremely dark sky over Teide Observatory in Spain's Canary Islands showsthe gegenschein as part of extended zodiacal light. Notable background objects include a bright meteor (on the left),the Big Dipper (top right), and Polaris (far right). The meteor nearly points toward Mount Teide, Spain's highest mountain, while the Pyramid solar laboratory is visible on the right. During the day, a phenomenon like the gegenschein called the glory can be seen in reflecting air or clouds opposite the Sun from an airplane.
2021年05月12日
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2021-03-11
2021年03月11日:黄道光与火星-(Zodiacal Light and Mars)
2021年03月11日:黄道光与火星-(Zodiacal Light and Mars)--原图下载{mtitle title="黄道光与火星"/}Image Credit &Copyright:Joshua Rhoades说明: 在这幅3月7日摄于美国伊利诺州荒野的静谧夜空影像里,刚日落的天空,有道淡淡的光带从西方的地平线向天空伸展。这片以古农庄为前景的景观里的光带,名为黄道光,在北半球春天期间,是日落后西方天空很醒目的晕光。在拍照那晚,黄道光带看似淹没了泛黄的火星和昴宿星团。而这二个近合的天体,则悬在老旧穀仓上方的星空中。黄道光是散布在太阳系黄道面附近的尘埃微粒,散射阳光所致。由于太阳系行星的轨道都在黄道面附近,故行星沉浸在黄道光里并不足为奇。然而,黄道光和火星的关联可能更深远。在朱诺号从地球前往木星的旅程中,意外侦测到行星际尘埃,而最近的分析指出,火星可能就是产生黄道光的尘埃之源头。{lamp/}原文:{mtitle title="Zodiacal Light and Mars"/}Image Credit &Copyright:Joshua RhoadesExplanation: Just after sunset on March 7, a faint band of light stillreaches above the western horizon in this serene,rural Illinois, night skyscape.Taken from an old farmstead, the luminous glow is zodiacal light,prominent in the west after sunset during planet Earth'snorthern hemisphere spring.On that clear evening the band of zodiacal light seemsto engulf bright yellowish Mars and the Pleiades star cluster.Their close conjunction isin the starry sky above the old barn's roof.Zodiacal light is sunlight scattered by interplanetary dust particlesthat lie near the Solar System's ecliptic plane.Of course all the Solar System's planets orbit near theplane of the ecliptic,within the band of zodiacal light.But zodiacal light and Mars may have a deeper connection.A recentanalysisofserendipitous detections of interplanetary dustby the Juno spacecraft during its Earth toJupiter voyagesuggest Mars is the likely source of the dust that produces zodiacal light.
2021年03月11日
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2020-08-12
2020年08月12日:NEOWISE彗星移动的彗尾-(The Shifting Tails of Comet NEOWISE)
[2020年08月12日:NEOWISE彗星移动的彗尾-(The Shifting Tails of Comet NEOWISE)--原图下载](https://apod.nasa.gov/apod/image/2008/NeowiseSequence_Llorens_3044_annotated.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2008/NeowiseSequence_Llorens_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2008/NeowiseSequence_Llorens_960_annotated.jpg';){mtitle title="NEOWISE彗星移动的彗尾"/}Image Credit & Copyright: Ignacio Llorens说明: 请细看NEOWISE彗星的离子尾。因为彗星的离子尾,叙说着地球绕日公转的故事。就像所有的彗星一样,NEOWISE彗星泛蓝的离子尾永远指向远离太阳的方向。不过在这幅影像里,随着NEOWISE彗星(C/2020 F3)绕行太阳,它的离子尾之指向也有些微的变化。这是因为在2020年7月17日到7月25日期间拍摄这幅主题影像时,地球在绕日轨道上移动了不小的距离。因为地球的运动,会造成太阳在地球天空中的移位。是以,纵然太阳并未直接出现在这幅主题影像里,离子尾的指向反应了太阳的位移。太阳进行视运动的黄道面,也是所有行星绕太阳公转的轨道面。这幅由5张照片精心合成的主题影像,精确的记录这颗彗星每晚的位置,以及在摄于西班牙.巴塞隆纳北边的图罗德霍姆山之前景照片上,外插出的5个太阳位置。如今踏上返回太阳系外围旅程的NEOWISE彗星,不再是上个月那个肉眼可见的精采 天体,但仍然是小望远镜可见。{lamp/}原文:{mtitle title="The Shifting Tails of Comet NEOWISE"/}Image Credit & Copyright: Ignacio LlorensExplanation: Keep your eye on the ion tail of Comet NEOWISE. A tale of this tail is the trail of the Earth.As with all comets, the blue ion tail always points away from the Sun.But as Comet C/2020 F3 (NEOWISE) rounded our Sun, its ion tail pointed in slightly different directions.This is because between 2020 July 17 and July 25 when the featured images were taken, the Earth moved noticeably in its orbit around the Sun.But the Earth's motion made the Sun appear to shift in the sky.So even though you can't see the Sun directly in the featured image(s), the directions of the ion tails reveal this apparent solar shift.The Sun's apparent motion is in the ecliptic, the common plane where all planets orbit. The featured five image composite was meticulously composed to accurately place each comet image -- and the five extrapolated solar positions -- on a single foreground image of Turó de l'Home Mountain, north of Barcelona, SpainComet NEOWISE is no longer the impressive naked-eye object it was last month, but it can still be found with a small telescope as it heads back to the outer Solar System.
2020年08月12日
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