保护地球，探索宇宙，发现文明
2021年7月22日 NGC 7814: Little Sombrero with Supernova Image Credit & Copyright: CHART32 Team, Explanation: Point your telescope toward the high flying constellation Pegasus and you can find this expanse of Milky Way stars and distant galaxies. NGC 7814 is centered in the pretty field of view that would almost be covered by a full moon. NGC 7814 is sometim...
2021年7月21日 Colors: Ring Nebula versus Stars Image Credit: Robert Vanderbei (Princeton U.) Explanation: What if you could see, separately, all the colors of the Ring? And of the surrounding stars? There’s technology for that. The featured image shows the Ring Nebula (M57) and nearby stars through such technology: in this case, a prism-like diffraction g...
2021年7月20日 Thor’s Helmet Image Credit & Copyright: Bernard Miller Explanation: Thor not only has his own day (Thursday), but a helmet in the heavens. Popularly called Thor’s Helmet, NGC 2359 is a hat-shaped cosmic cloud with wing-like appendages. Heroically sized even for a Norse god, Thor’s Helmet is about 30 light-years across. In fa...
2021年7月19日 Framed by Trees: A Window to the Galaxy Image Credit & Copyright: Will Godward Explanation: The photographer had this shot in mind for some time. He knew that objects overhead are the brightest — since their light is scattered the least by atmospheric air. He also that knew the core of our Milky Way Galaxy was just about straight up nea...
2021年7月18日 The Andromeda Galaxy in Ultraviolet Image Credit: NASA, JPL-Caltech, GALEX Explanation: What does the Andromeda galaxy look like in ultraviolet light? Young blue stars circling the galactic center dominate. A mere 2.5 million light-years away, the Andromeda Galaxy, also known as M31, really is just next door as large galaxies go. Spanning about 23...
2021年7月16日 Alphonsus and Arzachel Image Credit & Copyright: Noel Donnard Explanation: Point your telescope at tonight’s first quarter Moon. Along the terminator, the shadow line between night and day, you might find these two large craters staring back at you with an owlish gaze. Alphonsus (left) and Arzachel are ancient impact craters on the nort...
2021年7月16日 Love and War by Moonlight Image Credit & Copyright: Shi Huan Explanation: Venus, named for the Roman goddess of love, and Mars, the war god’s namesake, come together by moonlight in this serene skyview, recorded on July 11 from Lualaba province, Democratic Republic of Congo, planet Earth. Taken in the western twilight sky shortly after ...
2021年7月15日 The Dark Tower in Scorpius Image Credit & Copyright: Data – Martin Pugh Processing – Rocco Sung Explanation: In silhouette against a crowded star field along the tail of the arachnalogical constellation Scorpius, this dusty cosmic cloud evokes for some the image of an ominous dark tower. In fact, clumps of dust and molecular gas c...
2021年7月14日 GW200115: Simulation of a Black Hole Merging with a Neutron Star Video Credit: Simulation: S.V. Chaurasia (Stockholm U.), T. Dietrich (Potsdam U. & MPIGP); Visualization: T. Dietrich (Potsdam U. & MPIGP), N. Fischer, S. Ossokine, H. Pfeiffer (MPIGP) Explanation: What happens when a black hole destroys a neutron star? Analyses indicate th...
2021年7月13日 Saturn’s Iapetus: Painted Moon in 3D Image Credit: NASA, ESA, JPL, SSI, Cassini Imaging Team; 3D Rendering: NASA’s VTAD Explanation: What has happened to Saturn’s moon Iapetus? Vast sections of this strange world are dark brown, while others are as bright white. The composition of the dark material is unknown, but infrared spectr...