If Earth had no atmosphere like the Moon there would be no scattering, and the sky would remain black, even in daylight ...

It might seem like a simple question. But the science behind a blue sky isn't that easy. For starters, it involves something ...

and the outer edge is blue with light refracting at an angle of 22.37 degrees. You will usually see a Sun dog when the Sun is lower in the sky, so typically in the morning or evening. Just like ...