Add Yahoo as a preferred source to see more of our stories on Google. Lenticular clouds, like this one over a mountain in Chile, can look like flying saucers. Bilderbuch/Design Pics ...

Mysterious, motionless clouds often mistaken for UFOs are actually lenticular clouds, a well-understood meteorological phenomenon. These smooth, lens-shaped formations are created by stable air ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...