2025年11月25日
Comet Lemmon and the Milky Way
Image Credit & Copyright: Lin Zixuan (Tsinghua U.)
Explanation: What did Comet Lemmon look like when it was at its best? One example is pictured here, featuring three celestial spectacles all at different distances. The closest spectacle is the snowcapped Meili Mountains, part of the Himalayas in China. The middle marvel is Comet Lemmon near its picturesque best early this month, showing not only a white dust tail trailing off to the right but its blue solar wind-distorted ion tail trailing off to the left. Far in the distance on the left is the magnificent central plane of our Milky Way Galaxy, featuring dark dust, red nebula, and including billions of Sun-like stars. Comet C/2025 A6 (Lemmon) is already fading as it heads back into the outer Solar System, while the Himalayan mountains will gradually erode over the next billion years. The Milky Way Galaxy, though, will live on — forming new mountains and comets — for many billions of years into the future.
Tomorrow’s picture: huge ball of stars
彗星莱蒙与银河
影像提供与版权: Lin Zixuan (Tsinghua U.)
说明: 莱蒙（Lemmon）最美的时候是什么样子？这里展示了一个例子，图中包含了三种不同距离的壮观景象。最近的景像是白雪皑皑的梅里山，它是中国 喜马拉雅山脉的一部分。中间的奇观是彗星莱蒙在本月初接近其最佳观测状态时的样子，不仅可以看到向右延伸的白色尘埃尾，还有向左延伸的、被太阳风扭曲的蓝色离子尾。远处左侧是我们本银河系壮丽的中央盘面，那里有暗尘埃、红色星云，以及数十亿颗类太阳恒星。C/2025 A6（Lemmon）正在返回外太阳系的过程中逐渐黯淡，而喜马拉雅山脉将在未来数十亿年中逐渐被侵蚀殆尽。然而，本银河系将继续存在，在未来数十亿年中不断形成新的山脉和彗星。
明日的图片: huge ball of stars
