保护地球，探索宇宙，发现文明
2021年01月23日 Recycling Cassiopeia A Image Credit: X-ray – NASA, CXC, SAO; Optical – NASA,STScI Explanation: Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After a few million years, the enriched material is blasted back into i...
2021年01月22日 The Milky Ring Image Credit & Copyright: Alvin Wu Explanation: An expanse of cosmic dust, stars and nebulae along the plane of our Milky Way galaxy form a beautiful ring in this projected all-sky view. The creative panorama covers the entire galaxy visible from planet Earth, an ambitious 360 degree mosaic that took two years to complete. Nor...
2021年01月21日 M78 Wide Field Image Credit & Copyright: Wes Higgins Explanation: Interstellar dust clouds and glowing nebulae abound in the fertile constellation of Orion. One of the brightest, M78, is centered in this colorful, wide field view, covering an area north of Orion’s belt. At a distance of about 1,500 light-years, the bluish reflection ne...
2021年01月20日 The Magnetic Field of the Whirlpool Galaxy Image Credit: NASA, SOFIA, HAWC+, Alejandro S. Borlaff; JPL-Caltech, ESA, Hubble; Text: Jayanne English (U. Manitoba) Explanation: Do magnetic fields always flow along spiral arms? Our face-on view of the Whirlpool Galaxy (M51) allows a spectacularly clear view of the spiral wave pattern in a disk-shaped...
The core stage for the first flight of NASA’s Space Launch System, or SLS, rocket is seen in the B-2 Test Stand during a scheduled 8-minute duration hot fire test, Saturday, Jan. 16, 2021, at Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute and generated 1.6 million pounds of thrust. The hot...
2021年01月19日 A Lunar Corona with Jupiter and Saturn Image Credit & Copyright: Alessandra Masi Explanation: Why does a cloudy moon sometimes appear colorful? The effect, called a lunar corona, is created by the quantum mechanical diffraction of light around individual, similarly-sized water droplets in an intervening but mostly-transparent cloud. Since li...
北京时间2021年1月17日，在密西西比州圣路易斯湾附近NASA斯坦尼斯航天中心的B-2试验台上，NASA太空发射系统火箭的核心级进行了点火测试。 图片来源：NASA TV 北京时间2021年1月17日早晨6时27分，美国航空航天局（NASA）的太空发射系统（Space Launch System，SLS）火箭进行了核心级点火测试，作为“绿色试跑”（Green Run）8项系列测试中的最后一项，此次点火测试的目的是确保太空发射系统火箭核心级已经为发射阿尔忒弥斯1号（Artemis I）登月任务做好准备。 点火测试计划点燃火箭的全部4台RS-25引擎，且点燃的时间须略微超过8分钟，即发射后将火箭送入太空所需的时长。测试团队成功完成了倒计时并点燃了引擎，但在点火测试的过程中引擎主部件失灵并熄火超过1分钟。团队正在对...
全球年度温度评估；“首次”从空间站离港；整体整合（Green Run）点火测试（hot fire test）的进展……最近新闻速递，尽在「本周NASA」！ Credit：NASA NASA的一项分析发现，去年地球的全球平均地表温度是有记录以来仅次于2016年最热的一年。这意味着全球变暖的长期趋势仍在持续，过去的七年也是有记录以来最热的七年。 Credits: NASA GISS/Gavin Schmidt 利用不同的基线期和方法进行独立分析，美国海洋和大气管理局（National Oceanic and Atmospheric Administration）发现2020年是有记录以来第二热的一年，仅次于2016年。全球温度趋势的追踪在很大意义上指示着人类活动对气候和地球生命质量的影响。 另外推荐一段视频，全球变...
2021年01月18日 The Medulla Nebula Supernova Remnant Image Credit & Copyright: Russell Croman Explanation: What powers this unusual nebula? CTB-1 is the expanding gas shell that was left when a massive star toward the constellation of Cassiopeia exploded about 10,000 years ago. The star likely detonated when it ran out of elements, near its core, that could...
2021年01月17日 Jets from Unusual Galaxy Centaurus A Image Credit: ESO/WFI (visible); MPIfR/ESO/APEX/A. Weiss et al. (microwave); NASA/CXC/CfA/R. Kraft et al. (X-ray) Explanation: The jets emanating from Centaurus A are over a million light years long. These jets of streaming plasma, expelled by a giant black hole in the center of this spiral galaxy, light up th...