保护地球，探索宇宙，发现文明
2022年11月25日 NGC 6744: Extragalactic Close-Up Image Credit: NASA, ESA, and the LEGUS team Explanation: Beautiful spiral galaxy NGC 6744 is nearly 175,000 light-years across. That’s larger than the Milky Way. It lies some 30 million light-years distant in the southern constellation Pavo, with its galactic disk tilted towards our line of sight. This Hubbl...
2022年11月24日 Lynds Dark Nebula 1251 Image Credit & Copyright: Stefano Attalienti Explanation: Stars are forming in Lynds Dark Nebula (LDN) 1251. About 1,000 light-years away and drifting above the plane of our Milky Way galaxy, the dusty molecular cloud is part of a complex of dark nebulae mapped toward the Cepheus flare region. Across the spectrum, astr...
Snoopy, the zero-gravity indicator for NASA’s Artemis I flight test, floats in space on Nov. 20, 2022, while attached to his tether in the Orion spacecraft. In this enhanced image, Snoopy stands out in a custom orange spacesuit, while Orion’s interior has been shaded black and white for contrast. The character’s spacesuit is modeled after the sui...
2022年11月23日 Earthset from Orion Image Credit: NASA, Artemis 1 Explanation: Eight billion people are about to disappear in this snapshot from space. Taken on November 21, the sixth day of the Artemis 1 mission, their home world is setting behind the Moon’s bright edge as viewed by an external camera on the outbound Orion spacecraft. The Orion was headed...
NASA的詹姆斯·韦伯太空望远镜刚刚取得了另一个第一：一个遥远世界天空的分子和化学概况。 尽管韦伯和其他太空望远镜，包括NASA的哈勃望远镜和斯皮策望远镜，此前已经揭示了这颗炙烤星球大气层的孤立成分，但韦伯的新读数提供了一整套数据，包括原子、分子，甚至还有活跃化学和云层的迹象。 最新的数据也暗示了这些云层在近距离观察时的样子：:它们是分散的，而不是单一的、统一的覆盖在行星上。 该望远镜的高灵敏度仪器阵列对准了WASP-39 b的大气层，这是一颗 “热土星”（质量与土星差不多，但轨道比水星更紧），围绕一颗距离地球大约700光年远的恒星运行。 这些发现预示着韦布的仪器将有能力对科学界所希望的所有类型的系外行星（围绕其他恒星公转的行星）进行广泛的研究。这包括探测TRAPPIST-1系统中较小的...
NASA’s uncrewed Orion spacecraft snapped this black and white photo of Earth on Nov. 17, 2022, the second day of the 25.5-day Artemis I mission. The optical navigation camera is used to capture imagery of the Earth and the Moon at different phases and distances, which help establish its effectiveness as a way of determining its position in space for future m...
2022年11月22日 A Double Star Cluster in Perseus Image Credit & Copyright: Tommy Lease Explanation: Few star clusters this close to each other. Visible to the unaided eye from dark sky areas, it was cataloged in 130 BC by Greek astronomer Hipparchus. Some 7,000 light-years away, this pair of open star clusters is also an easy binocular target, a striking st...
On Nov. 20, the fifth day of the 25.5-day Artemis I mission, a camera mounted on the tip of one of Orion’s solar array wings captured this footage of the spacecraft and the Moon as it continued to grow nearer to our lunar neighbor. The spacecraft entered the lunar sphere of influence at 2:09 p.m. EST, making the Moon, instead of Earth, the main gravitational...
2022年11月21日 The Butterfly Nebula from Hubble Image Credit: NASA, ESA, Hubble; Processing: William Ostling Explanation: Stars can make beautiful patterns as they age — sometimes similar to flowers or insects. NGC 6302, the Butterfly Nebula, is a notable example. Though its gaseous wingspan covers over 3 light-years and its estimated surface temperature ...
2022年11月20日 Airglow Ripples over Tibet Image Credit & Copyright: Jeff Dai Explanation: Why would the sky look like a giant target? Airglow. Following a giant thunderstorm over Bangladesh in late April, giant circular ripples of glowing air appeared over Tibet, China, as pictured here. The unusual pattern is created by atmospheric gravity waves, waves of...