保护地球，探索宇宙，发现文明
This image from the NASA/ESA Hubble Space Telescope shows NGC 5307, a planetary nebula that lies about 10,000 light-years from Earth. It can be seen in the constellation Centaurus (the Centaur), which can be seen primarily in the southern hemisphere. A planetary nebula is the final stage of a Sun-like star. As such, planetary nebulas allow us a glimpse into ...
2019 August 31 Spitzer’s Orion Image Credit: NASA, JPL-Caltech Explanation: Few cosmic vistas excite the imagination like the Orion Nebula, an immense stellar nursery some 1,500 light-years away. Spanning about 40 light-years across the region, this infrared image from the Spitzer Space Telescope was constructed from data intended to monitor the bright...
根据最近的一项研究，由于新加入了NASA的地球观测卫星数据，美国对颗粒物的每日空气质量预测可能将更准确。 该研究的首席研究员、国家大气研究中心（National Center for Atmospheric Research，位于科罗拉多州博尔德）的Rajesh Kumar，每3小时将气溶胶光深度（optical depth）的卫星数据纳入国家海洋和大气管理局（NOAA）的国家空气质量预报能力（NAQFC）。这些变化使NAQFC测试中报告的颗粒污染物的准确度提高了大约38％，这将有助于美国环境保护局（EPA）的每日空气质量指数（Air Quality Index，AQI）预测。 空气质量指数通常用于当地天气预报，以便公众了解不健康的空气状况。 Credits: WSB-TV Atlanta 气象学家等通常使用A...
Sixteen years ago, NASA launched its Spitzer Space Telescope into orbit around the Sun. Since the observatory launched on Aug. 25, 2003, it has been lifting the veil on the wonders of the cosmos, from our own solar system to faraway galaxies, using infrared light. Spitzer’s primary mission lasted five-and-a-half years and ended when it ran out of the l...
2019 August 30 NGC 7129 and NGC 7142 Image Credit & Copyright: Steve Cannistra (StarryWonders) Explanation: This wide-field telescopic image looks toward the constellation Cepheus and an intriguing visual pairing of dusty reflection nebula NGC 7129 (right) and open star cluster NGC 7142. The two appear separated by only half a degree on the sky, but they...
在加州雷东多海滩诺斯罗普格鲁曼公司（Northrop Grumman），工程师们首次成功连接了NASA詹姆斯韦伯太空望远镜（James Webb Space Telescope）的两个组成部分，达到了一个重要的里程碑。一旦它到达太空，NASA最强大、最复杂的太空望远镜将使用红外光探索宇宙，从太阳系内的行星和卫星到最古老、最遥远的星系。 完全组装的詹姆斯韦伯太空望远镜。它的遮阳板和单元化托盘结构（unitized pallet structures，UPSs）可折叠在望远镜周围进行发射，可以看到有些部分被展开，以便能够安装望远镜。 Credits: NASA/Chris Gunn 为了将韦伯的两半组合在一起，工程师们使用起重机将望远镜（包括镜子和科学仪器）小心翼翼地抬起，移到已经组合的遮阳板和航天器上方。团队成员...
NASA completed a milestone in preparation for Green Run testing of its Space Launch System (SLS) core stage with an August 23-24, 2019, lift and installation of the core stage pathfinder simulator onto the B-2 Test Stand at Stennis Space Center. For this test of the new core stage, the team at Stennis will lift the flight core stage for Artemis 1, the first ...
2019 August 29 M27: Not a Comet Image Credit & Copyright: Bob Franke Explanation: While hunting for comets in the skies above 18th century France, astronomer Charles Messier diligently kept a list of the things he encountered that were definitely not comets. This is number 27 on his now famous not-a-comet list. In fact, 21st century astronomers would ide...
星虫150米飞行测试 来源:SpaceX 今天SpaceX的星际飞船原型，星虫（Starhopper）飞行高度为150米，在这之前，星虫进行了三次测试，前两次在4月初，为了安全起见，星虫没有离开地面，第三次是在7月25日，飞行高度为25米。 星虫由单台猛禽(raptor)发动机提供动力，猛禽是SpaceX正在研发的下一代发动机，用于星际飞船及其超重型火箭(Super Heavy)，猛禽是一款低温甲烷燃料火箭发动机，而目前猎鹰9号运载火箭中的燃料是煤油。马斯克之前说，可搭载100名乘客的星际飞船将配备6台猛禽发动机，超级重型火箭配备35台猛禽发动机，但未来发动机的数量有可能会发生变化。 2016年9月25日，猛禽火箭发动机在德克萨斯州McGregor测试场首次测试点火。 来源：SpaceX 未来星虫不再进行飞行测...
West Point graduate, physician and NASA astronaut Andrew Morgan is pictured working outside the International Space Station during a six-hour and 32-minute spacewalk to install the orbiting lab’s second commercial crew vehicle docking port, the International Docking Adapter-3 (IDA-3). Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon spacecraft...