保护地球，探索宇宙，发现文明
2022年1月16日 A Retreating Thunderstorm at Sunset Image Credit & Copyright: Alan Dyer (The Amazing Sky) Explanation: What type of cloud is that? This retreating cumulonimbus cloud, more commonly called a thundercloud, is somewhat unusual as it contains the unusual bumpiness of a mammatus cloud on the near end, while simultaneously producing falling rain on...
2022年1月15日 Galileo’s Europa Image Credit: NASA, JPL-Caltech, SETI Institute, Cynthia Phillips, Marty Valenti Explanation: Looping through the Jovian system in the late 1990s, the Galileo spacecraft recorded stunning views of Europa and uncovered evidence that the moon’s icy surface likely hides a deep, global ocean. Galileo’s Europa image d...
2022年1月14日 NGC 1566: The Spanish Dancer Spiral Galaxy Image Credit & Copyright: Mark Hanson and Mike Selby Explanation: An island universe of billions of stars, NGC 1566 lies about 60 million light-years away in the southern constellation Dorado. Popularly known as the Spanish Dancer galaxy, it’s seen face-on from our Milky Way perspective. A gorg...
This image, captured by the Landsat 8 satellite, shows the view over Western Australia on May 12, 2013. The image shows rich sediment and nutrient patterns in a tropical estuary area and complex patterns and conditions in vegetated areas. 这张由地球资源卫星8号拍摄的图像显示了2013年5月12日澳大利亚西部的景色。该图像显示了热带河口地区丰富的沉积物和养分模式以及植被区的复杂模式和条件。 The image is enhanced and involved masking, ...
行星XO-3b有一个内部热源，可能来自潮汐加热，这是由于其母星的引力挤压行星内部造成的。产生的热量可能会因行星略呈椭圆形的轨道（如右图所示）而增加，这意味着行星的形状更像椭圆形而不是圆形。 影像来源：NASA/JPL-Caltech 红外线天文台可能有助于回答有关太阳系外行星或系外行星的问题，包括它们是如何形成的以及是什么驱动了它们大气中的天气。 两项新的研究利用了NASA退役的斯皮策太空望远镜的数据，揭示了巨型系外行星和褐矮星，它们既不是恒星，也不是行星。 这两项研究都将成为1月13日美国天文学会主办的虚拟新闻发布会的焦点。 一项调查显示，褐矮星上的天气随年龄的变化而变化。褐矮星形成类似恒星，但没有足够的质量在其核心开始燃烧氢。褐矮星和巨型系外行星在直径、质量和组成方面相似，所以了解其中一颗的大气特性可以帮助...
2022年1月13日 Supernova Remnant Simeis 147 Image Credit & Copyright: Jason Dain Explanation: It’s easy to get lost following the intricate, looping, twisting filaments in this detailed image of supernova remnant Simeis 147. Also cataloged as Sharpless 2-240 it goes by the popular nickname, the Spaghetti Nebula. Seen toward the boundary of the constel...
Scores of baby stars shrouded by dust are revealed in this infrared image of the star-forming region NGC 2174, as seen by NASA’s Spitzer Space Telescope. Some of the clouds in the region resemble the face of a monkey in visible-light images, hence the nebula’s nickname: the “Monkey Head.” However, in infrared images such as this, the monkey...
韦伯已经开始对其单个光学仪器进行仔细的微调，使之成为一个巨大而精确的望远镜。 工程师们首先命令执行器——126个用于移动和调整主镜段的设备，以及6个用于定位次镜的设备——以验证发射后所有设备都按预期工作。该团队还命令执行器引导韦伯的精细转向镜进行微小的运动，以确认它们按预期工作。精密转向镜对对于图像稳定过程至关重要。 地面团队现在已开始指示开始指示主镜段和副镜从他们准备发射的配置中移出，离开舒适和安全的缓冲装置。这些移动至少需要十天时间，之后工程师可以开始为期3个月的对准镜片的过程，使其像一面镜子一样工作。 参考来源： https://blogs.nasa.gov/webb/2022/01/12/webb-begins-its-months-long-mirror-alignment/
2022年1月12日 Comet Leonard Closeup from Australia Image Credit & Copyright: Blake Estes (itelescope.net) Explanation: What does Comet Leonard look like up close? Although we can’t go there, imaging the comet’s coma and inner tails through a small telescope gives us a good idea. As the name implies, the ion tail is made of ionized gas — g...
Our Milky Way’s central black hole has a leak. This supermassive black hole looks like it still has the vestiges of a blowtorch-like jet dating back several thousand years. NASA’s Hubble Space Telescope hasn’t photographed the phantom jet but has helped find circumstantial evidence that it is still pushing feebly into a huge hydrogen cloud ...