2022年2月25日 Perseverance Sol 354 Image Credit: NASA, JPL-Caltech, Processing: Kenneth Kremer Explanation: This Navcam mosaic from Perseverance looks out over the car-sized rover’s deck, across the floor of Jezero crater on Mars. Frames used to construct the mosaic view were captured on mission […]
2022年2月24日 Beautiful Albireo AB Image Credit & Copyright: Robert Eder Explanation: Beta Cygni is a single bright star to the naked eye. About 420 light-years away it marks the foot of the Northern Cross, famous asterism in the constellation Cygnus. But a view through the eyepiece of a small tel
2022年2月23日 Orion over Green Bank Image Credit & Copyright: Dave Green Explanation: What will the huge Green Bank Telescope discover tonight? Pictured, the Robert C. Byrd Green Bank Telescope (GBT) on the lower right is the largest fully-pointable single-dish radio telescope in the world. With a
2022年2月22日 Illustration: An Early Quasar Illustration Credit & License: ESO, M. Kornmesser Explanation: What did the first quasars look like? The nearest quasars are now known to involve supermassive black holes in the centers of active galaxies. Gas and dust that falls toward a quasar glows br
2022年2月21日 Barred Spiral Galaxy NGC 6217 Image Credit: NASA, ESA, and the Hubble SM4 ERO Team Explanation: Many spiral galaxies have bars across their centers. Even our own Milky Way Galaxy is thought to have a modest central bar. Prominently barred spiral galaxy NGC 6217, featured here, was capture
2022年2月20日 Aurora Over White Dome Geyser Image Credit & Copyright: Robert Howell Explanation: Sometimes both heaven and Earth erupt. Colorful auroras erupted unexpectedly a few years ago, with green aurora appearing near the horizon and brilliant bands of red aurora blooming high overhead. A br
2022年2月19日 Peculiar Galaxies of Arp 273 Image Credit & Copyright: Jason Guenzel Explanation: The spiky stars in the foreground of this backyard telescopic frame are well within our own Milky Way Galaxy. But the two eye-catching galaxies lie far beyond the Milky Way, at a distance of over 300 mi
2022年2月18日 Three Clusters in Puppis Image Credit & Copyright: Dave Doctor Explanation: Galactic or open star clusters are young. The swarms of stars are born together near the plane of the Milky Way, but their numbers steadily dwindle as cluster members are ejected by galactic tides and gravita
2022年2月17日 Chamaeleon I Molecular Cloud Image Credit & Copyright: Acquisition: Stas Volskiy (Chilescope.com), Processing: Robert Eder Explanation: Dark markings and bright nebulae in this telescopic southern sky view are telltale signs of young stars and active star formation. They lie a mere 6
2022年2月16日 Eiffel Tower Prominence on the Sun Video Credit & Copyright: Hawk Wolinski Explanation: What’s that on the Sun? Although it may look like a flowing version of the Eiffel Tower, it is a solar prominence that is actually much bigger — about the height of Jupiter. The huge p
