保护地球，探索宇宙，发现文明
2019 September 30 Orion Rising over Brazil Image Credit & Copyright: Carlos Fairbairn Explanation: Have you seen Orion lately? The next few months will be the best for seeing this familiar constellation as it rises continually earlier in the night. However, Orion’s stars and nebulas won’t look quite as colorful to the eye as they do in this f...
Credit:NASA 近地轨道迎来新成员，欢迎登入空间站！更多的研究、物资和其他货物正被送往空间站；NASA的月球-火星探索再添新合作伙伴……最近新闻速递，尽在「本周NASA」！ 9月25日，三名最新“乘客”到达了国际空间站，他们从哈萨克斯坦拜科努尔航天发射场升空，航行了大约6小时。NASA的杰西卡•梅厄（Jessica Meir）、俄罗斯航天局（Roscosmos）的61/62远征队员奥列格•斯克里波奇卡（Oleg Skripochka）和阿联酋的航天参与员哈扎•阿里•曼苏里（Hazzaa Ali Almansoori）受到了站内机组人员的热情欢迎。61/62远征队员将协助完成约250项无法在地球上进行的调查研究和技术演示，这些研究能为日常生活带来潜在的利益，并使未来的长期深空探索成为可能。 9月26日，一...
2019 September 29 MyCn 18: The Engraved Hourglass Planetary Nebula Image Credit: NASA, ESA, Hubble; Processing & License: Judy Schmidt Explanation: Do you see the hourglass shape — or does it see you? If you can picture it, the rings of MyCn 18 trace the outline of an hourglass — although one with an unusual eye in its center. Either way, th...
Credit:NASA NASA的凌星系外行星巡天望远镜(TESS)首次观测到一起宇宙惨案，一颗黑洞撕裂了一颗恒星，称为潮汐瓦解事件（TDE），这起事件名为ASASSN-19bt。 NASA的尼尔·盖恩斯·斯威夫特天文台和其他设施将对此进行了后续观测，这是对恒星毁灭事件早期时刻迄今进行的最详细观察，研究论文发表在2019年9月27日的天体物理学杂志。 论文合作者Patrick Vallely称：“早期的TESS数据让我们能够看到离黑洞非常近的光，比我们之前看到的要近得多。”ASASSN-19bt的亮度上升非常平稳，这也有助于我们确定这是一起潮汐瓦解事件，而不是其他类型的爆发。 全天自动测量超新星（All Sky Automated Survey for SuperNovae，简写ASAS-SN）于1月29日发现...
2019 September 28 An Analemma of the Sun Image Credit & Copyright: Gyorgy Soponyai Explanation: This week the equinox found the Sun near the middle, but not at the crossing point, of an analemma in its annual trek through planet Earth’s skies. In this scenic view, that graceful, figure-8-shaped curve was intentionally posed above the iconic Danube...
Frank Rubio was selected by NASA to join the 2017 Astronaut Candidate Class and reported for duty in August 2017. He graduated from the U.S. Military Academy and earned a Doctorate of Medicine from the Uniformed Services University of the Health Sciences. Before attending medical school, he served as a UH-60 Blackhawk helicopter pilot and flew more than 1,10...
2019 September 27 The Annotated Galactic Center Image Credit & Copyright: Miguel Claro (TWAN, Dark Sky Alqueva) Explanation: The center of our Milky Way galaxy can be found some 26,000 light-years away toward the constellation Sagittarius. Even on a dark night, you can’t really see it though. Gaze in that direction, and your sight-line is quickly o...
黑洞的最新可视化展示了黑洞的重力如何扭曲我们的视线及其周围的环境，就像在哈哈镜中看到的那样。可视化效果模拟了黑洞的外观：落入黑洞的物质积聚在一个又薄又热的结构中，称为吸积盘（accretion disk）。 随着磁场在气体的搅动中缠绕并扭曲，明亮的“结点”不断在吸积盘中形成并消散。最靠近黑洞的位置气体以接近光速运转，而外部速度更慢。这种速度差拉伸并剪切了这些明亮的“结点”，在吸积盘中产生了或明或暗的路线。 从侧面看，在黑洞周围的气体湍流呈现出神奇的双峰状外观。黑洞的极端重力会改变来自吸积盘不同部分的光的路径，从而产生这般扭曲的图像。侧视时扭曲的程度最大。 Credits: NASA’s Goddard Space Flight Center/Jeremy Schnittman 这张图注释了黑洞可视化中的各个部分...
In our vast universe, the heaviest black holes grew from seeds. Nourished by the gas and dust they consume, or by merging with other dense objects, these seeds grow in size and heft to form the centers of galaxies, such as our own Milky Way. But unlike in the realm of plants, the seeds of giant black holes must have been black holes, too. And no one has ever...
2019 September 26 Da Vinci Rise Image Credit & Copyright: Likai Lin Explanation: An old Moon rose this morning, its waning sunlit crescent shining just above the eastern horizon before sunrise. But earthshine, light reflected from a bright planet Earth, lit the shadowed portion of the lunar disk and revealed most of a familiar lunar near side to early m...