哈勃的行星状星云视图揭示了复杂的结构

哈勃的行星状星云视图揭示了复杂的结构

ByNASA中文

NGC 6891 is a bright, asymmetrical planetary nebula in the constellation Delphinus, the Dolphin. This Hubble image reveals a wealth of structure, including a spherical outer halo that is expanding faster than the inner nebula, and at least two ellipsoidal shells that are orientated differently. The image also reveals filaments and knots in the nebula’s interior, surrounding the central white dwarf star. From their motions, astronomers estimate that one of the shells is 4,800 years old while the outer halo is some 28,000 years old, indicating a series of outbursts from the dying star at different times. NGC 6891是一个明亮的、不对称的行星状星云，位于海豚座。这张哈勃图像揭示了丰富的结构，包括一个比内星云膨胀得更快的球形外晕，以及至少两个方向不同的椭球壳。这张照片还揭示了星云内部围绕中央白矮星的丝状和结状结构。根据他们的运动，天文学家估计其中一个椭球壳有4,800年的历史，而外晕大约有28,000年的历史，这表明垂死的恒星在不同的时间发生了一系列的爆发。 Hubble studied NGC 6891 as part of efforts to gauge the distances to nebulae, and to learn more about how their structures formed and evolved. NGC…

黑洞碰撞可能发生光爆炸

黑洞碰撞可能发生光爆炸

ByNASA中文

In a first, astronomers may have seen light from the merger of two black holes, providing opportunities to learn about these mysterious dark objects. 天文学家们首次看到了来自两个黑洞合并产生的光线，为了解这些神秘的黑暗物体提供了机会。 This artist’s concept shows a supermassive black hole surrounded by a disk of gas. Embedded in this disk are two smaller black holes that may have merged together to form a new black hole. 这幅艺术家的概念图展示了一个被气体盘包围的超大质量黑洞。在这个气体盘中嵌入了两个较小的黑洞，它们可能合并在一起形成了一个新的黑洞。 When two black holes spiral around each other and ultimately collide, they send out gravitational waves – ripples in space and time that can be detected with extremely sensitive instruments on Earth. Since black holes and black hole mergers are completely dark, these events are invisible to telescopes and other light-detecting instruments used by astronomers. However, theorists have come up with ideas about how a…

哈勃见证了奔跑者星云中气体碰撞的冲击波

哈勃见证了奔跑者星云中气体碰撞的冲击波

ByNASA中文

Mounded, luminous clouds of gas and dust glow in this Hubble image of a Herbig-Haro object known as HH 45. Herbig-Haro objects are a rarely seen type of nebula that occurs when hot gas ejected by a newborn star collides with the gas and dust around it at hundreds of miles per second, creating bright shock waves. In this image, blue indicates ionized oxygen (O II) and purple shows ionized magnesium (Mg II). Researchers were particularly interested in these elements because they can be used to identify shocks and ionization fronts. 在这张哈勃拍摄的名为HH 45的赫比格-哈罗天体图像中，堆积的、发光的气体和尘埃云闪闪发光。赫比格-哈罗天体是一种罕见的星云，当新生恒星喷出的热气体以每秒数百英里的速度与周围的气体和尘埃碰撞，产生明亮的冲击波。在这张图片中，蓝色表示电离的氧（O II），紫色表示电离的镁（Mg II）。研究人员对这些元素特别感兴趣，因为它们可以用来识别冲击波和电离锋线。 This object is located in the nebula NGC 1977, which itself is part of a complex of three nebulae called The Running Man. NGC 1977 – like its companions NGC…

敬请关注DART！

敬请关注DART！

ByNASA中文

The Double Asteroid Redirection Test (DART), which will help determine if intentionally crashing a spacecraft into an asteroid is an effective way to change its course, is scheduled to launch no earlier than 1:21 a.m. EST Wednesday, Nov. 24 (10:21 p.m. PST Tuesday, Nov. 23) on a SpaceX Falcon 9 rocket from Vandenberg Space Force Base in California. 双重小行星重定向测试（DART）将有助于确定故意将航天器撞向小行星是否是改变其轨道的有效方式，该测试计划不早于美国东部时间11月24日星期三凌晨1:21（北京时间11月23日星期二晚上10:21），由SpaceX猎鹰9号火箭从加利福尼亚州范登堡空军基地发射。 This illustration is of the DART spacecraft and the Italian Space Agency’s (ASI) LICIACube prior to impact at the Didymos binary system. 这张插图是DART航天器和意大利航天局（ASI）的LICIACube在撞击Didymos双星系统之前的示意图。 DART is the agency’s first planetary defense test mission and the target asteroid is not a threat to Earth. DART是NASA的第一个行星防御测试任务，目标小行星对地球不构成威胁。 Learn more about social media and other activities for the mission. 了解更多关于该任务的社交媒体和其他活动。 Image Credits: NASA/Johns Hopkins, APL/Steve Gribben 图片来源: NASA/Johns Hopkins, APL/Steve Gribben

哈勃发现火焰星云中的尘埃漩涡

哈勃发现火焰星云中的尘埃漩涡

ByNASA中文

The Flame Nebula, also called NGC 2024, is a large star-forming region in the constellation Orion that lies about 1,400 light-years from Earth. It’s a portion of the Orion Molecular Cloud Complex, which includes such famous nebulae as the Horsehead Nebula and Orion Nebula. This image focuses on the dark, dusty heart of the nebula, where a star cluster resides, mostly hidden from view. Nearby (but not visible in this image) is the bright star Alnitak, the easternmost star in the Belt of Orion. Radiation from Alnitak ionizes the Flame Nebula’s hydrogen gas. As the gas begins to cool from its higher-energy state to a lower-energy state, it emits energy in the form of light, causing the visible glow behind the swirled wisps of dust….

Crew-1宇航员维克多·格洛弗与华盛顿特区的学生见面

Crew-1宇航员维克多·格洛弗与华盛顿特区的学生见面

ByNASA中文

NASA astronaut Victor Glover speaks with students about his time aboard the International Space Station, Thursday, Nov. 18, 2021, at Ben’s Chili Bowl in Washington. Students from Cardozo Educational Campus, Friendship Technology Preparatory High School, McKinley Technical High School, Phelps High School, and Wilson High School heard NASA astronauts Glover, Mike Hopkins, and Shannon Walker speak about the Crew-1 mission, the first crew rotation mission to the International Space Station. Part of the agency’s Commercial Crew Program, the crew was launched aboard a SpaceX Falcon 9 and Crew Dragon and spent 168 days in space. 2021年11月18日星期四，NASA宇航员维克多·格洛弗在华盛顿的本氏辣椒面馆与学生谈论他在国际空间站上的生活。来自卡多佐教育学院、友谊技术预备高中、麦金利技术高中、菲尔普斯高中和威尔逊高中的学生们听取了美国宇航局宇航员格洛弗、迈克-霍普金斯和香农·沃克关于Crew-1任务的演讲，这是第一次前往国际空间站的机组人员轮换任务。作为NASA商业宇航员计划的一部分，宇航员们乘坐SpaceX的猎鹰9号和载人龙飞船发射升空，在太空中度过了168天。 Image Credit: NASA/Joel Kowsky 图片来源：NASA/Joel Kowsky

准备下一次太空行走的宇航服

准备下一次太空行走的宇航服

ByNASA中文

Looking much like ghosts, a pair of U.S. spacesuits are pictured inside the International Space Station’s Quest airlock ready for an upcoming spacewalk to be conducted by NASA astronauts Thomas Marshburn and Kayla Barron. 看上去很像幽灵，图中一对美国宇航服在国际空间站的探索气闸内，为美国宇航局宇航员托马斯·马什本和凯拉·巴伦即将进行的太空行走做准备。 Image Credit: NASA 图片来源：美国宇航局

哈勃望远镜在IC2631中发现新形成的恒星

哈勃望远镜在IC2631中发现新形成的恒星

ByNASA中文

Stars are born from clouds of gas and dust that collapse under their own gravitational attraction. As the cloud collapses, a dense, hot core forms and begins gathering dust and gas, creating an object called a “protostar.” 恒星是由气体云和尘埃在自身引力作用下坍缩而形成。随着云团坍缩，会形成一个致密、炽热的核心，并开始聚集尘埃和气体，形成一个称为“原恒星”的物体。 This Hubble infrared image captures a protostar designated J1672835.29-763111.64 in the reflection nebula IC 2631, part of the Chamaeleon star-forming region in the southern constellation Chamaeleon. Protostars shine with the heat energy released by clouds contracting around them and the accumulation of material from the nearby gas and dust. Eventually enough material collects, and the core of a protostar becomes hot and dense enough for nuclear fusion to begin, and the transformation into a star is complete. The leftover gas and dust can become planets, asteroids, comets,…

从空间站观察地球

从空间站观察地球

ByNASA中文

As the International Space Station orbits the Earth, the crew makes observations of the universe and our home planet. This image taken from the space station shows the blue-green waters around the Bahamas, as shown in Space Station highlights for the week of Nov. 8, 2021. 当国际空间站绕地球运行时，宇航员对宇宙和我们的地球进行观察。这张从空间站拍摄的照片显示了巴哈马群岛周围的蓝绿色水域，如图所示，这是2021年11月8日这一周的空间站亮点。 Image Credit: NASA 影像来源：NASA

NASA的查斯·霍夫与他的印第安根相连

NASA的查斯·霍夫与他的印第安根相连

ByNASA中文

Chas Hoff, visited the Space Environments Facility in 2019 with a group of safety and mission assurance experts prior to testing of the Orion spacecraft. Credits: NASA 2019年于2019年与一组安全和任务保证专家一起参观了空间环境设施，随后对猎户座航天器进行了测试。 影像来源：NASA When Chas Hoff’s children started asking questions about his Native American heritage, he realized he didn’t have many answers. 当查斯·霍夫的孩子们开始询问他的印第安血统时，他意识到自己没有很多答案。 Hoff, a public affairs specialist at the NASA Safety Center in Cleveland, grew up in Dowagiac, Michigan, a center of Potawatomi culture near the Indiana border. And while he knew that he had family connections to the Potawatomi people, he never asked his relatives for more information. 霍夫是NASA克利夫兰安全中心的公共事务专家，在密歇根州的多瓦吉亚克长大，那里靠近印第安纳州边境的波塔瓦托米文化中心。虽然他知道自己与波塔瓦托米人有亲属关系，但他从未向亲属询问更多信息。 “Now I’m trying to patch together the stories and documents of my great grandmother, but like a lot of Native American history, it’s complicated,” he said. “After the…