保护地球, 探索宇宙, 发现文明
2023年3月29日 Sh2-308: A Dolphin Shaped Star Bubble Image Credit & Copyright: Aleix Roig (AstroCatInfo) Explanation: Which star created this bubble? It wasn’t the bright star on the bubble’s right. And it also wasn’t a giant space dolphin. It was the star in the blue nebula’s center, a famously energetic Wolf-Rayet star. Wolf-Rayet ...
2023年3月28日 A Multiple Green Flash Sunset Image Credit & Copyright: T. Slovinský & P. Horálek (IoP Opava); CTIO, NOIRLab, NSF, AURA Explanation: Yes, but can your green flash do this? A green flash at sunset is a rare event that many Sun watchers pride themselves on having seen. Once thought to be a myth, a green flash is now understood to occur whe...
The last rays of an orbital sunset illuminate the Earth’s atmosphere in this Feb. 17, 2023, photograph from the International Space Station as it orbited 269 miles above the Atlantic Ocean off the coast of Argentina. Astronauts aboard the space station see 16 sunrises and sunsets per day. Stay up to date with what’s happening aboard the space station. ...
2023年3月27日 Aurora Over Arctic Henge Image Credit & Copyright: Cari Letelier Explanation: Reports of powerful solar flares started a seven-hour quest north to capture modern monuments against an aurora-filled sky. The peaks of iconic Arctic Henge in Raufarhöfn in northern Iceland were already aligned with the stars: some are lined up toward the exact nor...
2023年3月26日 Wanderers Video Credit: Visuals: Erik Wernquist; Music: Christian Sandquist; Words & Voice: Carl Sagan Explanation: How far out will humanity explore? If this video’s fusion of real space imagery and fictional space visualizations is on the right track, then at least the Solar System. Some of the video’s wondrous sequences depict ...
2023年3月25日 Venus and the Da Vinci Glow Image Credit & Copyright: Giorgia Hofer Explanation: On March 23 early evening skygazers could watch Venus and a young crescent moon, both near the western horizon. On that date Earth’s brilliant evening star, faint lunar night side and slender sunlit crescent were captured in this telephoto skyscape posing a...
2023年3月24日 Outbound Comet ZTF Image Credit & Copyright: Rolando Ligustri Explanation: Former darling of the northern sky Comet C/2022E3 (ZTF) has faded. During its closest approach to our fair planet in early February Comet ZTF was a mere 2.3 light-minutes distant. Then known as the green comet, this visitor from the remote Oort Cloud is now nearly 13.3...
2023年3月23日 Spiral Galaxy NGC 2841 Image Credit & Copyright: Roberto Marinoni Explanation: A mere 46 million light-years distant, spiral galaxy NGC 2841 can be found in planet Earth’s night sky toward the northern constellation of Ursa Major. This sharp image centered on the gorgeous island universe also captures spiky foreground Milky Way stars an...
2023年3月22日 M31: The Andromeda Galaxy Image Credit & Copyright: Abdullah Al-Harbi Explanation: How far can you see? The most distant object easily visible to the unaided eye is M31, the great Andromeda Galaxy, over two million light-years away. Without a telescope, even this immense spiral galaxy appears as an unremarkable, faint, nebulous cloud in the c...
2023年3月21日 Dark Nebulae and Star Formation in Taurus Image Credit & Copyright: Vikas Chander Explanation: Can dust be beautiful? Yes, and it can also be useful. The Taurus molecular cloud has several bright stars, but it is the dark dust that really draws attention. The pervasive dust has waves and ripples and makes picturesque dust bunnies, but perhaps...