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.

On Saturday evening, the orange rays of the setting sun played on the underside of the blanket of cloud that covered so much of the western sky ... the fire of the sunset traced the topography ...

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