首页
关于人生天地间
Search
1
2021年09月08日:仙女大星系方向的深空影像-(The Deep Sky Toward Andromeda)
36 阅读
2
2017年11月29日:M42:猎户座大星云-(M42: The Great Orion Nebula)
25 阅读
3
欢迎来到人生天地间
24 阅读
4
2017年08月06日:银河与炸裂的流星-(Milky Way and Exploding Meteor)
13 阅读
5
2024年02月11日:直指月亮的火箭烟尘影子-(Rocket Plume Shadow Points to the Moon)
9 阅读
默认分类
每日天文图
登录
Search
标签搜索
地球
太阳
尘埃
银河系
光年
dust
Sun
哈伯太空望远镜
影像
Hubble Space Telescope
火星
主题影像
Earth
Milky Way Galaxy
上图
木星
土星
美国
太阳系
人生天地间
累计撰写
10,534
篇文章
累计收到
1
条评论
首页
栏目
默认分类
每日天文图
页面
关于人生天地间
搜索到
4
篇与
的结果
2021-02-13
2021年02月13日:爱神星的立体影像-(Stereo Eros)
2021年02月13日:爱神星的立体影像-(Stereo Eros)--原图下载{mtitle title="爱神星的立体影像"/}Image Credit: NEAR Project,JHU APL,NASA说明: 请取出你的红/蓝眼镜,体验漂浮在阋神星(433 Eros)旁边的感受。每1.8年绕行太阳一圈的这颗近地小行星,是以希腊神话的爱神为名。虽然如此,它的形状其实较像马铃薯而非爱心。长40公里、宽14公里、高14公里的这颗小天体,是个由起伏地平线、撞击坑、巨石和低谷聚成的世界。它的尺寸及很不浪漫的形状,在这幅由NEAR舒梅克卫星拍摄的照片合成之立体拼接影像里清楚可见。在这幅表面图里,NEAR舒梅克卫星的影像,为它的地形、结构及这颗都市大小的太阳系小天体,提供重要的量测数据。影像里,可解析的最小结构约为30公尺。从2000年2月14日起,NEAR舒梅克卫星以一年的时间绕行爱神星,成为首艘绕行小行星的地球太空船。而在2001年2月12日,它着陆在爱神星表面,成为首艘着陆在小行星的探测船。在2001年2月28日,NEAR舒梅克卫星最一次从爱神星表面回传讯息。{lamp/}原文:{mtitle title="Stereo Eros"/}Image Credit: NEAR Project,JHU APL,NASAExplanation: Get out yourred/blue glassesand float next toasteroid 433 Eros.Orbiting the Sun once every 1.8 years, the near-Earth asteroidis named for the Greek god of love.Still, its shape more closely resembles a lumpy potato than a heart.Eros is a diminutive 40 x 14 x 14 kilometer world of undulating horizons,craters, boulders and valleys.Its unsettling scale and unromantic shape are emphasized inthis mosaicof images from the NEAR Shoemaker spacecraftprocessed to yield a stereo anaglyphic view. Along with dramaticchiaroscuro,NEAR Shoemaker's 3-D imaging provided important measurementsof the asteroid's landforms and structures, andclues to the origin of thiscity-sized chunk of Solar System.The smallest features visible here are about 30 meters across.Beginning on February 14, 2000, historic NEAR Shoemakerspent a year in orbit around Eros,the first spacecraft to orbit an asteroid.Twenty years ago, on February 12 2001, it landed on Eros,the first ever landing on an asteroid's surface.NEAR Shoemaker'sfinal transmission from the surface of Eros was onFebruary 28, 2001.
2021年02月13日
0 阅读
0 评论
0 点赞
2019-12-18
2019年12月18日:中子星J0030表面的热点图-(A Hotspot Map of Neutron Star J0030's Surface)
2019年12月18日:中子星J0030表面的热点图-(A Hotspot Map of Neutron Star J0030's Surface)--原图下载{mtitle title="中子星J0030表面的热点图"/}Image Credit: NASA, NICER, GSFC's CI Lab说明: 中子星长什么样子?在以前,这些大小和城市相当的恒星,因为太小太远而无法分辨。不过最近经由仔细模拟,快速自转如何使中子星的X射线亮度出现明暗变化,从而绘製出首批标示其热点位置和大小的表面图。在这张根据目前最先进模型建构出的波霎 J0030+0451之热点图里,中子星的其他区域以斑驳的蓝色斑块填充。距离约1,000光年的J0030,每0.0049秒自转一次。推算这幅图的基础,是放置在国际太空站上的美国航太总署.中子星内部组成探测器(NICER)的X射线望远镜之量测数据。这些热点的推算位置颇出乎意料,而其原因仍未全然了解。此外,由于中子的重力透镜效应非常强,在地球方向可见到J0300超过一半的表面。研究像J0030这类波霎的外观 ,让我们得以精确估出中子星的质量、半径、以及让它不会内爆成黑洞的内部物理机制。(Neutron star Interior Composition ExploreR ─ NICER 中子星内部组成探测器){lamp/}原文:{mtitle title="A Hotspot Map of Neutron Star J0030's Surface"/}Image Credit: NASA, NICER, GSFC's CI LabExplanation: What do neutron stars look like?Previously these city-sized stars were too small and too far away to resolve.Recently, however, the first maps of the locations and sizes of hotspots on a neutron star's surface have been made by carefully modeling how the rapid spin makes the star's X-ray brightness rise and fall. Based on a leading model, an illustrative map of pulsar J0030+0451's hotspots is pictured, with the rest of the star's surface filled in with a false patchy blue. J0030 spins once every 0.0049 seconds and is located about 1000 light years away.The map was computed from data taken by NASA's Neutron star Interior Composition ExploreR (NICER) X-ray telescope attached to the International Space Station. The computed locations of these hotspots is surprising and not well understood.Because the gravitational lensing effect of neutron stars is so strong, J0300 displays more than half of its surface toward the Earth. Studying the appearance of pulsars like J0030 allows accurate estimates of the neutron star's mass, radius, and the internal physics that keeps the star from imploding into a black hole.
2019年12月18日
0 阅读
0 评论
0 点赞
2007-05-12
2007年05月12日:HD 189733b: 木星级的炽热外太阳系行星-(HD 189733b: Hot Jupiter)
2007年05月12日:HD 189733b: 木星级的炽热外太阳系行星-(HD 189733b: Hot Jupiter)--原图下载{mtitle title="HD 189733b: 木星级的炽热外太阳系行星"/}Credit: Heather Knutson (Harvard-Smithsonian CfA)et al.,NASA /JPL-Caltech说明: HD 189733b是颗木星大小的行星,绕着一颗离我们约63光年远的母星运行。虽然这颗遥远行星的体积和木星相当,不过它密近的轨道,让它远比我们太阳系最大的气态巨行星要来得热。和其他已侦测到的热木星一样,这颗外太阳系行星也是被潮汐力给锁住,永远以同一面对着母星,公转一圈只需要用上2.2个地球日。使用史匹哲太空望远镜的红外光数据,它表面的温度分布已被推算出来,而这也是首幅外太阳系行星的表面图。在上图中,愈亮的颜色对应愈高温的区域,而最热的区域并不在零经度,也就是说不在最靠近母星的位置附近,反而东移 (右方)了大约30度,这也证实行星强烈的环行风,对表面温度的分布有所影响。在这幅全行星表面图上,温度的变化範围介于摄氏650度到930度之间。{lamp/}原文:{mtitle title="HD 189733b: Hot Jupiter"/}Credit: Heather Knutson (Harvard-Smithsonian CfA)et al.,NASA /JPL-CaltechExplanation: HD 189733b is a Jupiter-sizedplanetknown to orbit a star some 63 light-years away.But while the distant world is approximately the size of Jupiter, itsclose-in orbit makes it much hotter than our solar system's rulinggas giant.Like other detectedhot Jupiters,its rotation is tidallylocked -- one side always faces its parent star as it orbitsonce every 2.2 days.Using infrareddata from theSpitzer Space Telescope,this planet's temperature variations have been mapped out-- the first map ever madefor a planet beyond our solar system.Seen here (brighter colors = higher temperatures),the hottest spot on the planet is not at longitude 0.0, the pointexactly facing the parent star.Instead, it's about 30 degrees to the east (right), evidence thatfierce, planet circling winds influence the temperature.In the planet-wide map,the temperature measurements vary from about930 to 650 degrees C (1,700 to 1,200 F).
2007年05月12日
0 阅读
0 评论
0 点赞
2006-08-20
2006年08月20日:小行星/灶神星的表面图-(A Map of Asteroid Vesta)
2006年08月20日:小行星/灶神星的表面图-(A Map of Asteroid Vesta)--原图下载{mtitle title="小行星/灶神星的表面图"/}Credit: B. Zellner (GSU), P. Thomas (Cornell), et al., WFPC2, HST, NASA说明: 在火星轨道外运行的灶神星 (Vesta),是个大小有五百公里的巨岩。上面这幅在1997发布的表面图,是由哈伯太空望远镜影像数据建构出来的,目的在于突显灶神星崎岖的表面上,有一个宽度几乎和这个小行星相当的陨石坑。在上面这张假色环状影像里,蓝色代表较低的地貌,而红色代表隆起的地形。证据显示在大约十亿年前,灶神星经历一次剧烈到几乎将它分裂的撞击。在1960年10月,一小块据信是来自灶神星的小石块掉到地球上,并在澳洲被发现。部份天文学家正考虑把灶神星重归类成行星的可能性。{lamp/}原文:{mtitle title="A Map of Asteroid Vesta"/}Credit: B. Zellner (GSU), P. Thomas (Cornell), et al., WFPC2, HST, NASAExplanation: Vesta is a huge rock 500 kilometers across that orbits out past Mars. In 1997, the above map of Vesta created using the Hubble Space Telescope was released showing a rugged surface highlighted by a single crater spanning nearly the entire length of the asteroid. The large crater dominates the lower part of the above false-color conglomerate image: blue indicates low terrain, while red indicates raised terrain. Evidence indicates that Vesta underwent a tremendous splintering collision about a billion years ago. In October 1960, a small chunk of this rock believed to have originated on Vesta fell to Earth and was recovered in Australia.Vesta is considered by some to be a candidate for reclassification into a planet.
2006年08月20日
0 阅读
0 评论
0 点赞