保护地球，探索宇宙，发现文明
2023年2月7日 A Comet and Two Dippers Image Credit & Copyright: Petr Horalek / Institute of Physics in Opava Explanation: Can you still see the comet? Yes. Even as C/2022 E3 (ZTF) fades, there is still time to see it if you know where and when to look. Geometrically, Comet ZTF has passed its closest to both the Sun and the Earth and is now headed back to th...
Officials from NASA, the Indian Space Research Organisation (ISRO), and the Indian Embassy visit a clean room at NASA’s Jet Propulsion Laboratory on Feb. 3, 2023, to view the scientific instrument payload for the NASA-ISRO Synthetic Aperture Radar (NISAR) mission. The NISAR mission—a joint effort between NASA and ISRO—will measure changes to Earth̵...
This Jan. 10, 2013, composite image of the giant barred spiral galaxy NGC 6872 combines visible light images from the European Southern Observatory’s Very Large Telescope with far-ultraviolet data from NASA’s Galaxy Evolution Explorer (GALEX) and infrared data acquired by NASA’s Spitzer Space Telescope. NGC 6872 is 522,000 light-years acros...
2023年2月6日 In the Heart of the Rosette Nebula Image Credit & Copyright: Lyman Insley Explanation: In the heart of the Rosette Nebula lies a bright cluster of stars that lights up the nebula. The stars of NGC 2244 formed from the surrounding gas only a few million years ago. The featured image taken in mid-January using multiple exposures and very specifi...
2023年2月5日 Enceladus by Saturnshine Image Credit: NASA; ESA, JPL, Cassini Imaging Team, SSI; Color Composite: Gordan Ugarkovic Explanation: This moon is shining by the light of its planet. Specifically, a large portion of Enceladus pictured here is illuminated primarily by sunlight first reflected from the planet Saturn. The result is that the normally snow-w...
2023年2月4日 NGC 2626 along the Vela Molecular Ridge Image Credit & Copyright: Mike Selby & Mark Hanson Explanation: Centered in this colorful cosmic canvas, NGC 2626 is a beautiful, bright, blue reflection nebula in the southern Milky Way. Next to an obscuring dust cloud and surrounded by reddish hydrogen emission from large H II region RCW 27 it lie...
2023年2月3日 Polaris and the Trail of Comet ZTF Image Credit & Copyright: David Ibarra Gomez Explanation: Stars trace concentric arcs around the North Celestial Pole in this three hour long night sky composite, recorded with a digital camera fixed to a tripod on January 31, near Àger, Lleida, Spain. On that date Comet C/2022 E3 (ZTF) was near its northernm...
天文学家利用NASA的哈勃太空望远镜首次直接测量了一颗孤立白矮星的质量，白矮星是一颗燃烧殆尽的类太阳恒星的残留核心。
The waxing gibbous Moon stands out in this Jan. 2, 2023, image from the International Space Station as it orbited 269 miles above the southern Indian Ocean. In 24 hours, the space station makes 16 orbits of Earth, traveling through 16 sunrises and sunsets. To find out where the ISS is now—or to get text or email alerts when it’s visible in your area—check ou...
2023年2月2日 Reflections on the 1970s Image Credit & Copyright: Daniel Stern Explanation: The 1970s are sometimes ignored by astronomers, like this beautiful grouping of reflection nebulae in Orion – NGC 1977, NGC 1975, and NGC 1973 – usually overlooked in favor of the substantial glow from the nearby stellar nursery better known as the Orion N...