Hundreds of millions of Americans will have the chance in March to see the first total lunar eclipse in nearly three years.

The moon's ascending node (the point in the sky where its orbit crosses the ecliptic from south to north) is moving westward ...

Ever wonder why the sky is blue, vs. say red, orange or purple? An effect called Rayleigh Scattering is part of the reason we see only blue, despite it all starting with a rainbow of colors.

The sky isn't just blue by chance. It takes all the colors of the rainbow for us to see it that way. It happens because of something called the Rayleigh effect, or Rayleigh scattering, named after a ...

Other atmospheric gases, such as carbon dioxide and methane, have little effect on sky color but play a crucial role in shaping the planet's climate. As the Sun moves lower in the sky, its light ...