A famous Pleiades star cluster is shown but showing numerous parallel and curved filaments in different colors. The image is in several colors of infrared light. A rollover image shows the cluster in visible light with its familiar blue light. Please see the explanation for more detailed information.
图中显示的是著名的昴宿星团，但呈现出不同颜色的无数平行和弯曲的丝缕状结构。该图像采用多种颜色的红外光。翻转图像显示的是可见光下的昴宿星团，并带有我们熟悉的蓝光。 有关更多详细信息，请参阅说明。
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 Pleiades can be seen with the unaided eye even from the depths of a light-polluted city. With a long exposure from a dark location, though, the dust cloud surrounding the Pleiades star cluster becomes very evident. The featured 11-hour exposure, taken from the Siding Spring Observatory in Australia, covers a sky area several times the size of the full moon. Also known as the Seven Sisters…
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 glow when excited by light from the Sun. Sunlight also liberates these molecules from Mercury’s surface and pushes them away. The yellow glow from sodium, in particular, is relatively bright. Pictured, Mercury and its sodium tail are visible in a deep image taken last week from La Palma, Spain through a filter that primarily transmits yellow light emitted by sodium. First predicted in the 1980s, Mercury’s tail was first discovered in 2001. Many tail details were revealed in…
