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)
39 阅读
2
欢迎来到人生天地间
29 阅读
3
2017年11月29日:M42:猎户座大星云-(M42: The Great Orion Nebula)
25 阅读
4
2017年08月06日:银河与炸裂的流星-(Milky Way and Exploding Meteor)
15 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)
12 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
10,554
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
10
篇与
的结果
2007-07-12
2007年07月12日:恆星后方的星系NGC 6384-(NGC 6384: Beyond the Stars)
2007年07月12日:恆星后方的星系NGC 6384-(NGC 6384: Beyond the Stars)--原图下载{mtitle title="恆星后方的星系NGC 6384"/}Credit & Copyright: Ken Crawford (Rancho Del Sol Observatory)说明: 宇宙到处都是星系,不过如果想看见它们,天文学家的视线得越过银河系的众星。以这幅彩色望远镜影像中的星系NGC 6384为例,它位在蛇夫座内,离我们约有八千万光年,大小约为一万五千光年,但这幅清晰影像,还是能清楚地呈现了这个遥远星系漩涡臂的细部构造和黄白色的星系核心,不过影像中的个别恒星,则都在离我们很近的前景,全位在我们银河系之内。银河系内较明亮恒星的绕射星芒,是由望远镜本身所造成的。这幅星野的跨度大约是1/4度,因为视线是往拥挤的银河系中心的方向看,所以见到了为数不少前景恒星。{lamp/}原文:{mtitle title="NGC 6384: Beyond the Stars"/}Credit & Copyright: Ken Crawford (Rancho Del Sol Observatory)Explanation: The universe is filledwithgalaxies.But to see them astronomers mustlook out beyond the stars ofour galaxy,the Milky Way.For example,consider thiscolorful telescopic view ofspiral galaxy NGC 6384, about 80 million light-yearsaway in the direction of the constellation Ophiuchus.At that distance, NGC 6384 spans an estimated 150,000 light-years.The sharp image shows details in the distant galaxy's blue spiralarms and yellowish core.Still, the individual stars seen in the pictureare all in the close foreground, wellwithin our owngalaxy.The brighter Milky Way stars show noticeable crosses, ordiffraction spikes,caused by the telescope itself.This particular field of view is about 1/4 degree wide andis relatively rich in foreground stars because itlooks outnear the crowded center of the Milky Way.
2007年07月12日
0 阅读
0 评论
0 点赞
2002-06-06
2002年06月06日:椎形星云的红外光特写影像-(Cone Nebula Infrared Close-Up)
2002年06月06日:椎形星云的红外光特写影像-(Cone Nebula Infrared Close-Up)--原图下载{mtitle title="椎形星云的红外光特写影像"/}Credit: NICMOS Group(STScI,ESA),NICMOS Science Team(Univ. Arizona),NASA说明: 在最近一次太空梭的哈伯望远镜维修任务中,太空人修复了近红外光相机与多天体光谱仪 (NICMOS)。接下来,天文学家迫不及待地用非常上镜头的恒星育婴室─椎形星云,来测试这部高性能的仪器。这张用近红外光相机所拍摄的椎形星云精彩特写影像,戏剧性地证实了哈伯望远镜的红外光视力已经被修复了。上面这张假色影像所涵盖的範围大约有半光年,影像中的云气和尘埃云位在钝状椎顶的恒星形成区。影像左方四颗产生绕射芒的明亮恒星,在可见光影像也看得到,它们实际上位在距离我们2500光年远的椎形星云前方。不过影像右边的暗淡恒星,位在椎状星云后方或者在它的内部。这张透过哈伯望远镜高红外光穿透力所拍摄的影像,头一次透露了这批恒星存在的讯息。{lamp/}原文:{mtitle title="Cone Nebula Infrared Close-Up"/}Credit: NICMOS Group(STScI,ESA),NICMOS Science Team(Univ. Arizona),NASAExplanation: After astronauts repaired NICMOS - theNear Infrared Camera and Multi-Object Spectrometer -during the latest Hubble Space Telescopeservicing mission,astronomers were quick to turn the sophisticated instrumenton the photogenic stellar nurseryknown as the Cone Nebula.This remarkableNICMOS close-up ofthe Cone Nebuladramatically confirms that the Hubble'sinfrared vision has beenrestored.Gas and dust clouds at the blunted tip of the cone-shapedstar-forming regionare seen here in false-color coveringan area about half a light-year across.Toward the left hand side of the picture,the four bright stars with diffraction spikesare also present in visible light images and are in front of theCone Nebula, itself 2,500 light-years away.But the fainter stars to their right are embedded in or behindthe nebula's obscuring dust clouds andare revealed only in thispenetrating infrared view.
2002年06月06日
0 阅读
0 评论
0 点赞
2002-03-09
2002年03月09日:似星体画廊-(A Quasar Portrait Gallery)
2002年03月09日:似星体画廊-(A Quasar Portrait Gallery)--原图下载{mtitle title="似星体画廊"/}Credit J. Bahcall (IAS, Princeton),M. Disney (Univ. Wales),NASA说明: 似星体(Quasars,QUASi-stellAR objects)是位于靠近目前已知宇宙的边缘。在1963年发现似星体时,天文学家为这些星体的光线能跨越数十亿光年而来到地球深感震惊,因为那表示似星体必须发出巨大的能量。这些能量是从何而来呢?很多天文学家多相信似星体的中心有一个巨大的黑洞,将大量掉入的气体、尘埃与星球转换成巨大的能量。在这一系列由哈伯太空望远镜所提供的似星体影像中,可以清楚地看到它们具有像亮星一样的绕射十字星芒。中间与右边两行的影像,透露出似星体与星系的碰撞与合併有关。那是因为星系碰撞时所产生的大量残渣,刚好可以用来餵食饥饿的黑洞。{lamp/}原文:{mtitle title="A Quasar Portrait Gallery"/}Credit J. Bahcall (IAS, Princeton),M. Disney (Univ. Wales),NASAExplanation: Quasars(QUASi-stellAR objects) lie near the edge of the observableUniverse.Discovered in 1963,astronomerswere astounded that such objects could bevisible across billions of light-years, as this implies they must emit prodigiousamounts of energy.Where doestheenergy come from?Many believe the quasar's central engine is a giant black holefueled by tremendous amounts of infalling gas, dust, and stars.Thisgallery of quasar portraits from the Hubble SpaceTelescope offers a look at their local neighborhoods: the quasars themselvesappear as the bright star-like objects with diffraction spikes.Theimages in the center and right hand columns reveal quasarsassociated with disrupted colliding and merging galaxieswhich should provideplentyof debris to feed a hungryblackhole.
2002年03月09日
0 阅读
0 评论
0 点赞
2001-05-02
2001年05月02日:HD 100546星周围的行星形成过程-(Planet Building in HD 100546)
2001年05月02日:HD 100546星周围的行星形成过程-(Planet Building in HD 100546)--原图下载{mtitle title="HD 100546星周围的行星形成过程"/}Credit: C. A. Grady et al. (NOAO, NASA/GSFC), CTIO, ESO, NSF说明: 在邻近的HD 100546星周围的拱星盘里,可能聚集着超过一兆颗的巨石。而根据现有的学说,我们太阳系在初形成时的情形可能和HD 100546很像。都是因为石块吸收尘埃而变得愈来愈大,慢慢地聚集成一颗颗的行星。如果地球是位在这么恶劣的环境里,因为不停的有明亮流星进入大气,所以天空不停地闪烁着亮光,而随着陨石不停地撞击地表,地面也会不停地颤抖。在上面这张影像中,HD 100546周围由尘埃、云气和石块所形成的拱星盘,就是影像中心四周的暗色区域。在这张假色影像里,原有的亮线和来自中央恒星的六角形绕射芒已经被移除。在不久之前,天文学家在猎户座 (Orion)也发现了许多称为原行星 (proplyds)的行星形成系统。这些恒星系统中刚在形成的行星,要能够承受周围亮星强烈辐射的洗礼,才能成为一颗颗真正的行星。HD 100546位在南天的苍蝇座 (Musca),距离我们只有335光年,用双筒望远镜就能看到它。{lamp/}原文:{mtitle title="Planet Building in HD 100546"/}Credit: C. A. Grady et al. (NOAO, NASA/GSFC), CTIO, ESO, NSFExplanation: More than 100 billion boulders may be swarming in the disk around nearby star HD 100546. In a scene thought similar to the early years of our own Solar System, ever larger rocks are growing by colliding and accreting dust as the messy business of planet formation appears to be underway. For an Earth-like planet in such a hostile environment, the sky would be lit continuously with streaking meteors and the ground would rumble continuously with impacts. Pictured above, the swirling disk of dust, gas, and rocks of HD 100546 is visible as the dark region surrounding the image center. The bright light and six-pointed diffraction spikes from the central star have been removed from the false-color image. HD 100546 is visible with binoculars towards the southern constellation of Musca, and is a relatively nearby 335 light-years away. Similar planet-building systems, dubbed proplyds, have recently been found in Orion, where many emerging planets there must survive the boiling radiations of neighboring bright stars.
2001年05月02日
0 阅读
0 评论
0 点赞
1
2