I was in Windows On The World the day before 9/11. It took me two years and folding a thousand origami cranes before I could write this essay; it's taken another 18 years for it to be published.

But whether the sky looks blue, green, or teal, this color signals an intense storm and time to immediately go inside. Let's zoom in on a thunderstorm. Thunderstorms contain a lot of water.

Back to Article List The sky isn’t just blue — airglow makes it green, yellow, and red too The sky looks blue on a sunny day. But at night, we can see the faint glow of its true color.

Biology is part of the reason we see the sky as blue. Those color-sensitive cones in our eyes react most strongly to blue, green, and red wavelengths; this is why we see colors the way we do. Blue and ...

When the sky turns green, we notice. I'm hoping the eldritch skies will get people to fight the coming climate catastrophe better than any dictionary-size international science report ever could.

If the sky does turn green, you can expect strong-to-severe weather in the form of either large hail or tornadoes. There is a misconception that a green sky means a tornado will appear.

So the sky isn't blue, at least not always. It is a glow-in-the-dark night sky too, colored a mix of green, yellow and red.

So the sky isn’t blue, at least not always. It is a glow-in-the-dark night sky too, coloured a mix of green, yellow and red.