保护地球，探索宇宙，发现文明
The featured image shows an orange sky with clouds across the bottom and several bright stars near the top center. Just at the top of the cloud deck on the left is a half-lit Moon. Please see the explanation for more detailed information.
这张特色图片显示了橙色的天空，底部有云，顶部中心附近有几颗明亮的星星。左侧云层顶部是半明半暗的月亮。有关更多详细信息，请参阅说明。
2022年12月5日 Pleiades: The Seven Sisters Star Cluster Image Credit & Copyright: Blake Estes (iTelescope Siding Spring Obs.) & Christian Sasse Explanation: Have you ever seen the Pleiades star cluster? Even if you have, you probably have never seen it as large and clear as this. Perhaps the most famous star cluster on the sky, the bright stars of the ...
2022年5月3日 Mercury’s Sodium Tail Image Credit & Copyright: Sebastian Voltmer Explanation: That’s no comet. Below the Pleiades star cluster is actually a planet: Mercury. Long exposures of our Solar System’s innermost planet may reveal something unexpected: a tail. Mercury’s thin atmosphere contains small amounts of sodium that glo...