The winter solstice, or the December solstice, is the point at which the path of the sun in the sky is farthest south. At the ...

The sky appears blue due to sunlight scattering in Earth's atmosphere. While sunlight contains all colors, blue light disperses most effectively, illuminating the sky. Although violet scatters more, ...

Here's everything you need to know about this week's parade of seven planets. Getty Images A seven-luminaries-deep parade of planets will line up and light up the night sky this week, folks. Just ...