An ominous green sky is often associated with severe weather, but not every storm causes the sky to change colors.

These clouds, that hover around 10,000 feet, are reflective when the sun is low in the horizon at dawn and dusk. If clouds and fog hang low in the sky, though, the sunset could be muted ...

NASA's Mars Exploration Rover Spirit captured this stunning view as the sun sank below the rim of Gusev crater on Mars.

After storms rolled through late Thursday afternoon, residents across Northeast Wisconsin saw some interesting cloud patterns ...