Most commonly seen in the sky around the Arctic and Antarctic and other polar zones, the northern lights ... arcs, rays, bursts or on occasion, simply a subtle glow. The brilliant light forms ...

Astronomers have released new “Christmas Tree Cluster” images using ... data is the stars and X-ray data is the blue and white lights that resemble glowing dots of light on the tree.

materials allow some light to pass through them. In translucent materials, not all light passes through and sometimes it changes direction, therefore images ... to your eye. Ray diagrams are ...