保护地球，探索宇宙，发现文明
A person stands looking over a lake. High in a partly cloudy sky is the Sun. A close look at the Sun will show that there is a dark spot in the center — the Moon during an annular eclipse. Please see the explanation for more detailed information.
一个人站在湖边眺望。在多云的天空中，太阳高高挂起。仔细观察太阳，会发现中央有一个黑点，这就是日环食时的月球。有关更多详细信息，请参阅说明。
2023年3月28日 A Multiple Green Flash Sunset Image Credit & Copyright: T. Slovinský & P. Horálek (IoP Opava); CTIO, NOIRLab, NSF, AURA Explanation: Yes, but can your green flash do this? A green flash at sunset is a rare event that many Sun watchers pride themselves on having seen. Once thought to be a myth, a green flash is now understood to occur whe...
2021年01月25日 Southern Cross over Chilean Volcano Image Credit & Copyright: Tomáš Slovinský Explanation: Have you ever seen the Southern Cross? This famous four-star icon is best seen from Earth’s Southern Hemisphere. The featured image was taken last month in Chile and captures the Southern Cross just to the left of erupting Villarrica, one of the ...