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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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2023-11-28
2023年11月28日:朱诺号影像:木卫三-(Ganymede from Juno)
2023年11月28日:朱诺号影像:木卫三-(Ganymede from Juno)--原图下载{mtitle title="朱诺号影像:木卫三"/}Image Credit & Copyright: NASA/JPL-Caltech/SwRI/MSSS;Processing & License:Kevin M. Gill;说明: 太阳系最大的卫星长什么模样?木星的卫星木卫三,个头甚至比水星及冥王星大;冰冷的表面则满是明亮的年轻撞击坑,其下叠着古老、黝黑、坑洼起伏的原野,并间杂着沟槽和山脊。沟槽地形的成因目前仍是研究的课题,主要的假说之一认为可能与冰板块的移动有关。木卫三咸信有个水量超过地球的海洋层,其中或许蕴藏着生命。与月亮类似,木卫三也是以同一面向着其中央行星─木星。这张主题影像,是由美国航太总署的朱诺号太空船,在2021年飞越这颗大卫星时所拍摄。经过这次近距离的飞越,朱诺号把绕行木星的轨道週期从53天缩短到43天。朱诺号将持续研究木星这颗巨行星的高重力、不寻常磁场及複杂的云层结构。{lamp/}原文:{mtitle title="Ganymede from Juno"/}Image Credit & Copyright: NASA/JPL-Caltech/SwRI/MSSS;Processing & License:Kevin M. Gill;Explanation: What does the largest moon in the Solar System look like? Jupiter's moon Ganymede, larger than even Mercury and Pluto, has an icy surface speckled with bright young craters overlying a mixture of older, darker, more cratered terrain laced with grooves and ridges. The cause of the grooved terrain remains a topic of research, with a leading hypothesis relating it to shifting ice plates. Ganymede is thought to have an ocean layer that contains more water than Earth -- and might contain life. Like Earth's Moon, Ganymede keeps the same face towards its central planet, in this case Jupiter. The featured image was captured in 2021 by NASA's robotic Juno spacecraft when it passed by the immense moon. The close pass reduced Juno's orbital period around Jupiter from 53 days to 43 days. Juno continues to study the giant planet's high gravity, unusual magnetic field, and complex cloud structures.
2023年11月28日
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2023-01-02
2023年01月02日:日落后的行星游行-(After Sunset Planet Parade)
[2023年01月02日:日落后的行星游行-(After Sunset Planet Parade)--原图下载](https://apod.nasa.gov/apod/image/2301/AllPlanets_Tezel_1680_annotated.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2301/AllPlanets_Tezel_1080.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2301/AllPlanets_Tezel_1080_annotated.jpg';){mtitle title="日落后的行星游行"/}Image Credit &Copyright: Tunc Tezel(TWAN)说明: 在今晚抬头仰望可见太阳系所有的行星。在刚日落之后往西看,能同时见到金星、土星、木星和火星。在上面这个由西向东的行星排列里,金星离地平线最近,而且会紧随太阳西沉。届时无论你地球何处,只要天空清朗都能见到这个初晚的行星游行。这幅摄于上个月底的主题影像,就记录了上述的这些行星及其他天体,其中同时可见的还有月亮和水星,以及裸视极限之下的海王星和天王星,从而组成这幅几乎聚集所有行星的全景图。影像的前景,则是土耳其.卡什邻近地中海岸的小村庄Gökçeören周围的群山。此外,牛郎、北落师门、毕宿五以及昴宿星团也是影像里很醒目的天体。随着1月流逝,金星在日落时会升得更高,不过土星将逐渐下沉。{lamp/}原文:{mtitle title="After Sunset Planet Parade"/}Image Credit &Copyright: Tunc Tezel(TWAN)Explanation: Look up tonight and see a whole bunch of planets.Just after sunset, looking west, planets Venus, Saturn, Jupiter and Mars will all be simultaneously visible.Listed west to east, this planetary lineup will have Venus nearest the horizon, but setting shortly after the Sun. It doesn't matter where on Earth you live because this early evening planet parade will be visible through clear skies all around the globe. Taken late last month, the featured image captured all of these planets and more: the Moon and planet Mercury were also simultaneously visible. Below visibility were the planets Neptune and Uranus, making this a nearly all-planet panorama.In the foreground are hills around the small village of Gökçeören, Kaş, Turkey, near the Mediterranean coast. Bright stars Altair, Fomalhaut, and Aldebaran are also prominent, as well as the Pleiades star cluster.Venus will rise higher in the sky at sunset as January continues, but Saturn will descend.
2023年01月02日
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2022-08-09
2022年08月09日:告别地球-(Leaving Earth)
2022年08月09日:告别地球-(Leaving Earth)--原图下载2022 August 9 {mtitle title="告别地球"/}Video Credit: NASA/JHU Applied Physics Lab/Carnegie Inst. Washington说明: 离开地球会看到什么景观?这种机会就出现在8年前,当信使号太空船旋绕过地球前往内围的水星时,就曾传神且详细的记录了这种场景。在上面这部缩时影片中,可见到地球不停自转并逐渐远去。而受阳光照耀射的地球白昼面过于明亮,以至背景恒星都被淹没而不可见。在目前,信使号太空船已入轨绕行水星,而且最近刚完成水星全部表面的测绘工作。 不过,信使号偶而也会回首眺望它的家乡地球。 信使号是少数建造于地球,在离开后永不复返的物体之一。 因为在信使号任务结束时,它行将坠毁在水星表面。{lamp/}原文:{mtitle title="Leaving Earth"/}Video Credit: NASA/JHU Applied Physics Lab/Carnegie Inst. WashingtonExplanation: What it would look like to leave planet Earth?Such an event was recorded visually in great detail by the MESSENGER spacecraft as it swung back past the Earth in 2005 on its way in toward the planet Mercury.Earth can be seen rotating in this time-lapse video, as it recedes into the distance.The sunlit half of Earth is so bright that background stars are not visible.The robotic MESSENGER spacecraft orbit around Mercury from 2011 to 2015 has conducted the first complete map of the surface.On occasion, MESSENGER has continued to peer back at its home world.MESSENGER is one of the few things created on the Earth that will never return. At the end of its mission MESSENGER crashed into Mercury's surface.
2022年08月09日
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2022-06-29
2022年06月29日:太阳系家族的合照-(Solar System Family Portrait)
[2022年06月29日:太阳系家族的合照-(Solar System Family Portrait)--原图下载](https://apod.nasa.gov/apod/image/2206/SolSysPortrait_Trigo_1920.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2206/SolSysPortrait_Trigo_1080.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2206/SolSysPortrait_Trigo_1080_annotated.jpg';){mtitle title="太阳系家族的合照"/}Image Credit & Copyright: Alexis Trigo说明: 你曾同时见到所有的太阳系行星吗?这种罕见的“行星点名”景观,几乎整个6月的清晨皆可见。这幅在数个早晨前摄于智利.圣佩德罗德阿塔卡马镇近郊的鱼眼镜头全天主题影像,不但捕捉了所有行星的列队游行,也拍到位在火星与金星之间的月亮。在这张太阳系家族照里,在黄道上由左到右依序为地球、土星、海王星、木星、火星、天王星、金星、水星、和地球。为易于看见它们的相对位置,海王星及天王星经过人为强化增亮。此外,水星下方的山峰是利坎卡武尔火山。在7月,水星将隐没在太阳的炫光里,不过,在数天后会在另一侧的夜空中复现。接着在8月,土星将通过与太阳180度反向 的位置,成为傍晚时分才可见的天体。下次想在清晨天空再同时见到这8颗大行星,得等到2122年。{lamp/}原文:{mtitle title="Solar System Family Portrait"/}Image Credit & Copyright: Alexis TrigoExplanation: Yes, but have you ever seen all of the planets at once?A rare roll-call of planets has been occurring in the morning sky for much of June. The featured fisheye all-sky image, taken a few mornings ago near the town of San Pedro de Atacama in Chile, caught not only the entire planet parade, but the Moon between Mars and Venus. In order, left to right along the ecliptic plane, members of this Solar System family portrait are Earth, Saturn, Neptune, Jupiter, Mars, Uranus, Venus, Mercury, and Earth. To emphasize their locations, Neptune and Uranus have been artificially enhanced.The volcano just below Mercury is Licancabur.In July, Mercury will move into the Sun's glare but reappear a few days later on the evening side. Then, in August, Saturn will drift past the direction opposite the Sun and so become visible at dusk instead of dawn. The next time that all eight planets will be simultaneously visible in the evening sky will be in 2122.
2022年06月29日
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2022-05-03
2022年05月03日:水星的钠尾-(Mercury's Sodium Tail)
[2022年05月03日:水星的钠尾-(Mercury's Sodium Tail)--原图下载](https://apod.nasa.gov/apod/image/2205/MercuryTailPleiades_Voltmer_1448.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2205/MercuryTailPleiades_Voltmer_960.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2205/MercuryTailPleiades_Voltmer_960_annotated.jpg';){mtitle title="水星的钠尾"/}Image Credit & Copyright: Sebastian Voltmer说明: 上面影像中的这种长尾,通常和彗星有紧密的关联;不过,这道长尾并非来自彗星。出现在昴宿星团下方的这颗天体,其实是水星。针对我们太阳系最内围的行星所进行的长曝光摄影,偶而会意外发现它有尾巴。水星稀薄的大气含有少量的钠,而钠在阳光的激发下也发出泛黄的明亮萤光。 除此之外,阳光也会把这些分子从水星表面释放出来,并向后方推送。在这幅于上星期在西班牙.拉帕玛岛,透过纳黄光滤镜拍摄的深空影像里,水星和它的钠尾清楚可见。 远在1980年代即预言存在的水星钠尾,直到2001年才首次观测到。美国航太总署.信使号太空船在2011年到2015年绕行水星时进行的多次观测,曾进一步解析出钠尾的许多细节。{lamp/}原文:{mtitle title="Mercury's Sodium Tail"/}Image Credit & Copyright: Sebastian VoltmerExplanation: That's no comet. Below the Pleiades star cluster is actually a planet: Mercury.Long exposures of our Solar System's innermost planet may reveal something unexpected: a tail.Mercury's thin atmosphere contains small amounts of sodium that glow when excited by light from the Sun.Sunlight also liberates these atoms from Mercury's surface and pushes them away.The yellow glow from sodium, in particular, is relatively bright. Pictured, Mercury and its sodium tail are visible in a deep image taken last week from La Palma, Spainthrough a filter that primarily transmits yellow light emitted by sodium.First predicted in the 1980s, Mercury's tail was first discovered in 2001.Many tail details were revealed in multiple observations by NASA's robotic MESSENGER spacecraft that orbited Mercury between 2011 and 2015. Tails, of course, are usually associated with comets.
2022年05月03日
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2021-07-06
2021年07月06日:土星与六颗卫星-(Saturn and Six Moons)
[2021年07月06日:土星与六颗卫星-(Saturn and Six Moons)--原图下载](https://apod.nasa.gov/apod/image/2107/SaturnAndMoons_Ranjbaran_2692.jpg"onMouseOver="if (document.images)document.imagename1.src='image/2107/SaturnAndMoons_Ranjbaran_960_annotated.jpg';"onMouseOut="if (document.images)document.imagename1.src='image/2107/SaturnAndMoons_Ranjbaran_960.jpg';){mtitle title="土星与六颗卫星"/}Image Credit & Copyright: Mohammad Ranjbaran; MR Thanks: Amir Ehteshami说明: 土星有多少颗卫星?目前获得确认的有82颗,最小者的宽度远小于1公里。在这幅由摄于上个月最后二星期的13张短曝光土星照片组合而成的影像里,可见到土星的6颗大卫星。其中,比月亮大、更稍大于水星、直径高达5,150公里的土星最大卫星土卫六,几乎环绕这颗带环母行星一圈。由荷兰天文学家惠更斯于1655年发现的土卫六,是人类找到的第一颗土星天然卫星,而相较之下,有数颗土星的新卫星,发布的日期近在2019年。影像右缘的迹线来自土星第三大的卫星─土卫八。色彩缤纷的土卫八轨道非常宽广,因此这幅影像只记录轨道的一小部分。在这个月刚日落之后,土星会比木星早从东南方升起,带头移过夜空并且在日出前皆可见。(Titan 土卫六;Iapetus 土卫八){lamp/}原文:{mtitle title="Saturn and Six Moons"/}Image Credit & Copyright: Mohammad Ranjbaran; MR Thanks: Amir EhteshamiExplanation: How many moons does Saturn have?So far 82 have been confirmed, the smallest being only a fractionof a kilometer across.Six of its largest satellites can be seen here in a composite image with 13 short exposure of the bright planet, and13 long exposures of the brightest of its faint moons, taken over two weeks last month. Larger than Earth's Moon and even slightly larger than Mercury,Saturn's largest moonTitan has a diameter of 5,150 kilometers and was captured making nearly a complete orbit around its ringed parent planet. Saturn's first known natural satellite, Titan wasdiscovered in 1655 byDutch astronomer Christiaan Huygens, in contrast with several newly discovered moons announced in 2019. The trail on the far right belongs to Iapetus, Saturn's third largest moon.The radius of painted Iapetus' orbit is so large that only a portion of it was captured here.Saturn leads Jupiter across the night sky this month, rising soon after sunset toward the southeast, and remaining visible until dawn.
2021年07月06日
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