保护地球, 探索宇宙, 发现文明
2023年3月18日 Wolf-Rayet 124 Image Credit: NASA, ESA, CSA, STScI, Webb ERO Production Team Explanation: Driven by powerful stellar winds, expanding shrouds of gas and dust frame hot, luminous star Wolf-Rayet 124 in this sharp infrared view. The eye-catching 6-spike star pattern is characteristic of stellar images made with the 18 hexagonal mirrors of the James ...
沃尔夫-拉叶星是已知的最明亮、质量最大、可探测时间最短的恒星之一，这颗罕见的恒星是NASA詹姆斯·韦伯太空望远镜于2022年6月首次观测到的恒星之一。韦伯用其强大的红外仪器以前所未有的细节展示了这颗名为WR 124的恒星。这颗恒星位于1.5万光年外的人马座。
大约一万年前，船帆座的一颗巨星爆炸发出的光到达了地球。这颗超新星留下了一个被称为脉冲星的致密物体，它在旋转时似乎有规律地变亮，就像一座宇宙灯塔。从这颗脉冲星的表面，出现了以接近光速传播的粒子风，形成了带电粒子和磁场的混乱大杂烩，并与周围的气体相撞。这种现象被称为脉冲星风星云。 这张照片显示了船帆座脉冲星风星云。浅蓝色代表来自NASA X射线成像偏振探测器的X射线偏振数据。粉色和紫色对应于NASA钱德拉X射线天文台的数据，该天文台此前曾多次观测到船帆座。NASA的哈勃太空望远镜拍摄了背景中的恒星。单击此处查看未标记的图像。 影像来源：X射线： (IXPE) NASA/MSFC/Fei Xie & (Chandra) NASA/CXC/SAO；光学：NASA/STScI Hubble/Chandra；由N...
2023年3月3日 RCW 86: Historical Supernova Remnant Image Credit: CTIO/NOIRLab/DOE/NSF/AURA, T.A. Rector (Univ.of Alaska/NSF’s NOIRLab), J. Miller (Gemini Obs./NSF’s NOIRLab), M. Zamani & D. de Martin (NSF’s NOIRLab) Explanation: In 185 AD, Chinese astronomers recorded the appearance of a new star in the Nanmen asterism. That part of the sky is identified wi...
2023年1月15日 M1: The Crab Nebula from Hubble Image Credit: NASA, ESA, Hubble, J. Hester, A. Loll (ASU) Explanation: This is the mess that is left when a star explodes. The Crab Nebula, the result of a supernova seen in 1054 AD, is filled with mysterious filaments. The filaments are not only tremendously complex, but appear to have less mass than expelled in th...
2022年11月29日 The Gum Nebula Supernova Remnant Image Credit & Copyright: Victor Lima Explanation: Because the Gum Nebula is the closest supernova remnant, it is actually hard to see. Spanning 40 degrees across the sky, the nebula appears so large and faint that it is easily lost in the din of a bright and complex background. The Gum Nebula is highlighted ...
When a massive star collapsed in the Cassiopeia constellation, it generated a supernova explosion with some of the fastest shockwaves in the Milky Way. These speedy shock waves are one of the reasons the Cassiopeia A (Cas A) supernova remnant was chosen to be our Imaging X-ray Polarimetry Explorer’s (IXPE) first observed object. This composite image, made of...
2022年10月2日 Supernova Cannon Expels Pulsar J0002 Image Credit: F. Schinzel et al. (NRAO, NSF), Canadian Galactic Plane Survey (DRAO), NASA (IRAS); Composition: Jayanne English (U. Manitoba) Explanation: What could shoot out a neutron star like a cannon ball? A supernova. About 10,000 years ago, the supernova that created the nebular remnant CTB 1 not only des...
影像来源：X射线：NASA/CXC/GSFC/B. J. Williams et al.；可见光：NASA/ESA/STScI 虽然天文学家已经看到了银河系和附近星系中数十颗爆炸恒星的碎片，但通常很难确定恒星消亡的时间线。通过使用NASA望远镜研究邻近星系中壮观的超新星遗迹，一组天文学家已经找到了足够的线索来帮助时光倒流。 超新星遗迹SNR 0519-69.0（简称SNR 059）是白矮星爆炸产生的碎片。在达到临界质量后，无论是从伴星中吸取物质还是与另一颗白矮星合并，恒星都经历了热核爆炸并被摧毁。科学家们将这种被称为Ia型的超新星用于广泛的科学研究，从热核爆炸研究到测量数十亿光年的星系距离。 SNR 0519位于大麦哲伦星云中，这是一个距离地球160,000光年的小星系。这张合成图像显示了来自NASA钱德拉X射...
Supernovas are the explosive deaths of the universe’s most massive stars. In death, these objects blast powerful waves into the cosmos, destroying much of the dust surrounding them. This 2007 composite from NASA’s Spitzer Space Telescope and Chandra X-ray Observatory shows the remnant of such an explosion, known as N132D, and the environment it i...