Bright blue-white noctilucent clouds danced over the town of Nykøbing Mors in Denmark just before dawn, just when this spectacular photo was taken. Night sky photographer Ruslan Merzlyakov ...

"Fallstreak holes," also known as "hole punch clouds," which were seen Jan. 7 in satellite images from Indiantown through Miami, can punch clear through to show blue sky, or be more opaque ...

Bright blue-white noctilucent clouds danced over the town of Nykøbing Mors in Denmark just before dawn, just when this spectacular photo was taken. Night sky photographer Ruslan Merzlyakov ...