保护地球，探索宇宙，发现文明
2022年9月30日 Equinox Sunrise Around the World Collage Image Copyright: Luca Vanzella Explanation: A planet-wide collaboration resulted in this remarkable array of sunrise photographs taken around the September 2022 equinox. The images were contributed by 24 photographers, one in each of 24 nautical time zones around the world. Unlike more complicated civil tim...
On Sept. 21, 2022, the James Webb Space Telescope delivered the clearest view of Neptune’s rings in more than 30 years. Webb’s Near-Infrared Camera (NIRCam) captured several bright, narrow rings as well as the planet’s fainter dust bands. Voyager 2 was the last to detect some of these rings during its flyby in 1989, but this is the first time we have an infr...
2022年9月29日 DART Asteroid Impact from Space Image Credit: ASI / NASA Explanation: Fifteen days before impact, the DART spacecraft deployed a small companion satellite to document its historic planetary defense technology demonstration. Provided by the Italian Space Agency, the Light Italian CubeSat for Imaging Asteroids, aka LICIACube, recorded this image of ...
Astronaut Ellen Ochoa, STS-110 flight engineer, wears a launch and entry suit as part of water survival training in the Neutral Buoyancy Laboratory at the Sonny Carter Training Facility near NASA’s Johnson Space Center in Houston, Texas in 2001. STS-110 was the 13th shuttle mission to visit the International Space Station (ISS). The mission included 4 spacew...
数十亿年来，银河系最大的卫星星系——大麦哲伦星云和小麦哲伦星云——经历了一段危险的旅程。当它们被拉向我们的银河系时，它们相互环绕，开始解体，留下气态碎片的痕迹。然而，令天文学家困惑的是，这些矮星系仍然完好无损，恒星形成仍在继续。 “很多人都在努力解释，这些物质流为什么会在那里。”科罗拉多学院助理教授达内什·克里希纳劳说。“如果这些星系中的气体被移除，它们怎么还在形成恒星？” 借助于NASA哈勃太空望远镜和一颗名为远紫外光谱探测器（FUSE）的退役卫星的数据，由克里希纳劳领导的一组天文学家终于找到了答案：麦哲伦星系被星系冕（一种热增压气体的保护屏障）所包围。星系冕将这两个星系被包裹起来，防止它们的气体供应被银河系吸走，从而使它们能够继续形成新的恒星。 研究人员利用类星体紫外线的光谱观测来探测和绘制麦哲伦星系冕，这...
2022年9月28日 A Furious Sky over Mount Shasta Image Credit & Copyright: Ralf Rohner Explanation: Is the sky angry with Mount Shasta? According to some ancient legends, the spirits of above and below worlds fight there, sometimes quite actively during eruptions of this enormous volcano in California, USA. Such drama can well be imagined in this deep sky ima...
In this image from Sept. 26, 2022, the Double Asteroid Redirection Test (DART) team, Dr. Thomas Zurbuchen, and guests at Johns Hopkins University Applied Physics Laboratory cheer as they receive confirmation of DART’s collision with the asteroid Dimorphos—the world’s first planetary defense technology demonstration. During the spacecraft’s final moments befo...
2022年9月27日 DART: Impact on Asteroid Dimorphos Video Credit: NASA, JHUAPL, DART Explanation: Could humanity deflect an asteroid headed for Earth? Yes. Deadly impacts from large asteroids have happened before in Earth’s past, sometimes causing mass extinctions of life. To help protect our Earth from some potential future impacts, NASA tested a new planet...
经过10个月的太空飞行，NASA的双小行星重定向测试（DART）——世界上第一次行星防御技术演示——于周一成功撞击了小行星目标，这是NASA首次尝试在太空移动小行星。 参考来源：NASA 位于马里兰州劳雷尔的约翰霍普金斯应用物理实验室（APL）的任务控制中心于美国东部时间下午7点14分宣布成功撞击。 作为NASA整体行星防御战略的一部分，DART与小行星Dimorphos的撞击展示了一种可行的缓解技术，可以保护地球免受小行星或彗星（如果发现的话）的袭击。 “DART的核心是代表了行星防御的空前成功，但它也是一项团结的任务，真正造福于全人类。”NASA局长比尔·纳尔逊表示。“当NASA研究宇宙和我们的家园星球时，我们也在努力保护这个家园，这次国际合作将科幻小说变成了科学事实，展示了一种保护地球的方法。” DART...
Technicians prepare to move NASA’s Double Asteroid Redirection Test (DART) spacecraft from a shipping container onto a work stand inside the Astrotech Space Operations Facility at Vandenberg Space Force Base in California in this image from Oct. 4, 2021. DART was launched on Nov. 23, 2021, aboard a SpaceX Falcon 9 rocket from Vandenberg. The spacecraft will ...