EarthSky | What are star trails, and how can I capture them?
What are star trails? Photographers point cameras skyward and take long-exposure photos. You see streaks caused by Earth's rotation.
Source: earthsky.org
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EarthSky | Iridescent clouds have rainbow colors
Clouds with rainbow colors are called iridescent clouds. The names comes from Iris, the Greek personification of the rainbow. Photos here.
Source: earthsky.org
EarthSky | What makes a halo around the sun or moon?
A large ring or circle of light around the sun or moon is called a 22-degree halo by scientists.
Source: earthsky.org