2
votes
1answer
71 views

Can small clouds reflect enough light to hurt your eyes/blind you?

I looked out my window a minute ago and immediately noticed a very bright spot where a cloud and a jet/plane trail met. The spot was so bright that I thought the sun was behind it because it left that ...
4
votes
2answers
1k views

Why does earth look blue from outer space?

I know it's more than 70% water. But what has it got to do with earth's colour ?
3
votes
0answers
314 views

How to turn water opaque by pouring the smallest quantity of matter into it?

Consider a glass of water and a glass of coffee. Their contents differ by no more than a few grams of particles coming from the roasted and ground coffee, yet the former lets almost all visible light ...