Macquarie University researchers have demonstrated a technique to dramatically narrow the linewidth of a laser beam by a ...

However, aluminum is tricky. The element is difficult to measure with lasers, as well as cool to absolute zero. But when ...

Researchers have cracked a fundamental optical challenge: how to control both angle and wavelength of light independently—a ...

Some stars have a much different end of life than previously thought. Astronomers have observed for the first time traces of a star that exploded twice. This discovery challenges current ...

We measure the luminance of the diffusing surface (about 140 cd/m²) with a certified luminance-meter. Knowing the entrance light flux, the sensor response, and the shutter speed, we can then calculate ...

One of the main objectives of the Hubble Space Telescope, launched in 1990, was to measure the size and age of the Universe, ...

A light-year is a unit of measurement used to describe the vast distances between objects in space. It represents the distance that light, traveling at a speed of approximately 300,000 kilometers per ...

We measure the extremely long distances between things in space by light years. A light year is the distance that light travels in one Earth year. Light travels at about 300,000 kilometres per second.

The awe-inspiring distances of the cosmos are hard to visualise, so how can we be certain we are measuring them correctly?

According to a provocative new study, that might just be our cosmic address. This idea is meant to solve one of the biggest ...