保护地球，探索宇宙，发现文明
A spectacular head-on collision between two galaxies fueled the unusual triangular-shaped star-birthing frenzy, as captured in this image from the Hubble Space Telescope. The interacting galaxy duo is collectively called Arp 143. The pair contains the glittery, distorted, star-forming spiral galaxy NGC 2445 at right, along with its less flashy companion, NGC...
2022年4月11日 A Space Station Crosses a Busy Sun Image Credit & Copyright: Wang Letian (Eyes at Night) Explanation: Typically, the International Space Station is visible only at night. Slowly drifting across the night sky as it orbits the Earth, the International Space Station (ISS) can be seen as a bright spot several times a year from many locations. The...
2022年4月10日 Shadows at the Moon’s South Pole Image Credit: NASA, Arizona State U., Lunar Reconnaissance Orbiter Explanation: Was this image of the Moon’s surface taken with a microscope? No — it’s a multi-temporal illumination map made with a wide-angle camera. To create it, the Lunar Reconnaissance Orbiter spacecraft collected 1,700 i...
2022年4月9日 Mars-Saturn Conjunction Image Credit & Copyright: Damian Peach Explanation: Fainter stars in the zodiacal constellation Capricornus are scattered near the plane of the ecliptic in this field of view. The two brightest ones at center aren’t stars at all though, but the planets Mars and Saturn. Taken on the morning of April 4, the telescop...
Axiom Mission 1 (Ax-1) is in the foreground on Launch Pad 39A with NASA’s Artemis I in the background on Launch Pad 39B on April 6, 2022. This is the first time two totally different types of rockets and spacecraft designed to carry humans are on the sister pads at the same time—but it won’t be the last as NASA’s Kennedy Space Center in Florida continues to ...
Japan’s Geiyo Archipelago, in the Seito Inland Sea, was once home to pirates. From the 9th to the 16th centuries, the pirates dominated the Inland Sea and terrorized the coasts of East Asia. Until the Shimanami Kaido (Inland Wave Sea Road) was completed in 1999, the Geiyo Islands were a remote region, accessible only by boat. This ASTER image was acqui...
2022年4月8日 Hale-Bopp: The Great Comet of 1997 Image Credit & Copyright: Stefan Seip (TWAN) Explanation: Only twenty-five years ago, Comet Hale-Bopp rounded the Sun and offered a dazzling spectacle in planet Earth’s night skies. Digitized from the original astrophoto on 35mm color slide film, this classic image of the Great Comet of 1997 was recorde...
2022年4月7日 Messier 24: Sagittarius Star Cloud Image Credit & Copyright: Gabriel Rodrigues Santos Explanation: Unlike most entries in Charles Messier’s famous catalog of deep sky objects, M24 is not a bright galaxy, star cluster, or nebula. It’s a gap in nearby, obscuring interstellar dust clouds that allows a view of the distant stars in the ...
NASA and industry partners are working towards a future that sees aviation meet cleaner sustainability standards. To that end, new designs for the airplanes of tomorrow, such as the Transonic Truss-Braced Wing (TTBW) concept shown in this image from 2021, are being tested by researchers and engineers. The TTBW is essentially a classic tube-and-wing passenger...
在过去三个月的大部分时间里，中红外仪器（MIRI）和韦伯的其他仪器一直在通过向黑暗的太空辐射热能来冷却。近红外仪器将在大约34到39开尔文的温度下工作，被动冷却。但是MIRI的探测器需要更低的温度才能探测到波长更长的光子。这就是MIRI低温冷却器的用武之地。 根据需要，MIRI探测器使用了一种特殊的掺砷硅（Si:As）配方制造，需要在低于 7 开尔文的温度下才能正常工作。仅靠被动方式是不可能达到如此低的温度，因此韦伯携带了一个专门用于冷却MIRI探测器的“低温冷却器”。 图片来源：NASA/JPL-Caltech。 “在过去的几周里，低温冷却器一直在通过MIRI光学平台循环冷氦气，这将帮助MIRI冷却到大约15开尔文。很快，低温冷却器将经历其任务中最具挑战性的几天。操作低温阀门时，低温冷却器将改变循环氦气的方向...