THE velocity of light is one of the most fundamental 1 of the constants of Nature, and this fact alone would justify the attempt to measure its value with the highest possible precision. But in ...

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 ...

There seems to be a discrepancy between measurement of the expansion of the Universe using radiation in the early Universe and using nearby objects. Researchers have now contributed to this debate by ...

In the summer of 1926, an experimental beam of light pierced the night sky between two precisely measured peaks in the San Gabriel Mountains, and science history was made. Virtually unseen by the ...

Observational clues The transit of Venus allows a geometrical measurement of the Earth–Sun distance, and a measurement of the speed of light. (Courtesy: iStock/milehightraveler) Light is so ...

Aeva Technologies, a developer of lidar systems based in Mountain View, Calif., has unveiled the Aeva Eve 1V, a high-precision, non-contact motion sensor built on its frequency modulated continuous ...

And that is absolutely 100% accurate, with no measurement errors. But Jack, I hear you say, what are you talking about? The reason we know that that's exactly the speed of light, is that we defined it ...

Movement of charge carriers perpendicular to an electric driving field in a solid state system detected for the first time with sub-picosecond time resolution, scientists have observed through a new ...

Approximately four years ago, NASA/Marshall Space Flight Center initiated a program to develop a laser Doppler heterodyne technique for the measurement of a local mean and fluctuating gas velocity ...

Archery and target shooting with firearms and air guns are just a few of the many sports and pastimes that involve high-speed projectiles. Try this measurement technique. Archery and target shooting ...

IN a letter in Nature, 142, 833 (1938), I described a new method of measuring the velocity of light in which Fizeau's toothed wheel was replaced by a piezo-quartz crystal. When placed in an ...