Since Earth rotates on an axis that is roughly 23.5°, there are times on its path around the sun where our part of the planet is tilted toward the sun and times when in is tilted away. This is very ...

In a discovery that challenges conventional optics, scientists have managed to make a laser beam cast its own shadow—a feat previously thought impossible, as light typically passes through other light ...

A team of scientists has found that the narrow beam of a laser, under specific conditions, can cast a shadow — a counterintuitive finding that could open the doors for new applications of optical ...

In this educational film, children explore the concept of light while playing hide and seek. They learn how light travels from sources to their eyes, how some objects block light to create shadows, ...

PITTSBURGH (KDKA) -- Shadows are pretty much an everyday or every night occurrence. Since light travels in a straight line, when something gets in the way of that path, it creates an absence of light, ...

In factories, lighting has traditionally been provided by grids of 277V fluorescent fixtures hanging overhead. This provides good ambient lighting, especially where things such as machines, panels, ...

This activity is part of the Science Friday Sun Camp collection! For 4.5 billion years, the Sun has generated energy to power the solar system. Visible light is the most obvious form of that energy.