The northern and southern lights, auroras visible from the poles, glow with a range of different colored lights. Here's the reason for each of those colors.

Though scientists aren't sure how the lithosphere came to be divided into plates, certain aspects of Earth's geology keep the plate tectonic engine chugging along. For a planet to sustain plate ...

Young, commander of the Apollo 16 mission, took a far-ultraviolet photo of Earth with an ultraviolet ... red (brightest), resulting in the enhanced-color image seen here. Dr.