ST. LOUIS – The sky is always changing colors—from a bright blue on a clear day, to red and orange sunrises or sunsets, or multiple colors of a rainbow—there’s a lot going on that we don ...

ST. LOUIS – The sky is always changing colors—from a bright blue on a clear day, to red and orange sunrises or sunsets, or multiple colors of a rainbow—there’s a lot going on that we don ...

I live on the east coast of the US (NJ). I noticed in August about 10pm looking ESE a star that was pulsing bright colors. It looked like an LED toy light flashing red, green, blue, red, white and ...

In the sky opposite the sun, light takes a longer trip through the atmosphere and disproportionately loses lower-energy colors. There, high-energy UV light accounts for a greater proportion of the ...

It has to do with the way light scatters. By Kenneth Chang To understand how smoke from Canadian wildfires is turning skies in many places orange this week, it helps to first ask: Why is the sky ...

NASA's Curiosity rover on Mars recorded this image of the sun setting in a blue-tinged sky, the first picture taken in full color in its nearly three-year mission. It's one of a series of photos ...

Star colors are not easy to see chiefly because our eyes' color sensors — the cones of the retina — are quite insensitive to dim light. At night, the rods take over, but they are effectively ...