NASA shares three never-before-seen images of Mars with the caption “You have a letter from Mars” …

Raleigh, the scientist who defined the reason for the blue color of the sky, faced a big question: Why is the color of the sea blue? Raleigh explained that the reflection of the sky is the reason for the blue...

Moments when it seems as if the earth itself. If you look at the sun, there is only one day in a year. A single day that combines six months of night and six months of day. Everywhere you look...