保护地球，探索宇宙，发现文明
2021年11月03日 The Horsehead and Flame Nebulas Image Credit & Copyright: Wissam Ayoub Explanation: The Horsehead Nebula is one of the most famous nebulae on the sky. It is visible as the dark indentation to the orange emission nebula at the far right of the featured picture. The horse-head feature is dark because it is really an opaque dust cloud that lies...
N44是一个复杂的星云，充满了发光的氢气、黑暗的尘埃带、大质量恒星和许多不同年龄的恒星群。然而，它最显着的特征之一是被称为“超级气泡”的黑暗星空间隙，在这张哈勃太空望远镜图像中上部中央区域可见。 这个黑洞大约有250光年宽，它的存在仍然是一个谜。气泡内部的大质量恒星喷出的恒星风可能赶走了气体，但这与测量到的气泡中的风速不一致。另一种可能性是，由于星云中充满了大质量恒星，这些恒星会在巨大的爆炸中消亡，古老超新星不断膨胀的外壳塑造了宇宙洞穴。 天文学家在超级气泡附近发现了一颗超新星遗迹，并确定超级气泡内部和边缘的恒星之间存在大约 500 万年的年龄差异，表明存在多个连锁反应的恒星形成事件。超级气泡周围大约 5 点钟方向的深蓝色区域是星云中最热的区域之一，也是恒星形成最强烈的区域。 N44是一个发射星云，这意味着它的...
In this image taken on Oct. 30, 2021, an aurora dimly intersected with Earth’s airglow as the International Space Station flew into an orbital sunrise 264 miles above the Pacific Ocean before crossing over Canada. 在这张拍摄于2021年10月30日的图片中，当国际空间站在飞越加拿大之前在太平洋上空264英里处的轨道上飞行时，极光与地球的气光黯然相交，。 Image Credit: NASA 图片来源：美国宇航局
2021年11月02日 SN Requiem: A Supernova Seen Three Times So Far Image Credit: NASA, ESA, Hubble; Data: S. A. Rodney (U. South Carolina) et al.; Image Processing: J. DePasquale (STScI) Explanation: We’ve seen this same supernova three times — when will we see it a fourth? When a distant star explodes in a supernova, we’re lucky if we see it even...
Steven Lighthill, an enrolled descendent of the Karuk tribe of northern California, began his lifelong career in art when he began his studies at the age of 16, taking courses in painting, sculpture, and jewelry during high school in northern California. After a tour of active duty with the U.S. Air Force, he went back to college to study design, earning a d...
2021年11月01日 A Waterfall and the Milky Way Image Credit & Copyright: Xie Jie Explanation: The dream was to capture both the waterfall and the Milky Way together. Difficulties included finding a good camera location, artificially illuminating the waterfall and the surrounding valley effectively, capturing the entire scene with numerous foreground and back...