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

When the Sun is near the horizon, its light passes through a lot more of the atmosphere to reach the Earth's surface than ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to ...

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