Select an option below to continue reading this premium story. Already a Honolulu Star-Advertiser subscriber? Log in now to continue reading. To illustrate, a laser might be very bright (candela), but ...

For centuries, scientists have tried to measure the speed of light directly and failed every single time. Light moves so fast ...

TROY — Can a measurement be placed on the amount of security a light can provide? The comfort derived from its presence? Or its ability to create the ideal atmosphere for reading? Lighting experts ...

I recently ended up using mine to measure light and sound in my room, which also happens to be my home office. I was trying ...

The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...

WEST LAFAYETTE, Ind. -- Purdue University researchers have demonstrated a new method for using lasers and semiconductors to more accurately measure the velocity of a moving object. The method relies ...

Today’s Google Doodle pays homage to a discovery that has had a profound effect on astronomy and essentially all of our observations of the Universe. The animation depicts Ole Rømer, a Danish ...

No matter how fast you move, the light will always catch you. Nowadays we take the speed of light for granted. It's a fundamental constant of the universe: light simply travels at the speed it does ...

Non-dispersive infrared (NDIR) sensors are increasingly being used in multi-sensor instruments to measure LEL combustible gas. While they offer a number of significant advantages, NDIR sensors also ...