Astrophysicists propose a new “stochastic siren” method using the gravitational-wave background from black hole mergers to ...

Guided wave radar technology is highly suited to very difficult level measurement applications. A typical guided wave radar setup will involve a transmitter that is installed on top of a vessel or ...

Astronomers have long known the universe is expanding—but exactly how fast remains one of the biggest mysteries in cosmology. Different techniques for measuring the Hubble constant stubbornly disagree ...

We have known for several decades that the universe is expanding. Scientists use multiple techniques to measure the present-day expansion rate of the universe, known as the Hubble constant. These ...

In 1885, an English scientist, Lord Rayleigh, had hypothetically shown 3 that waves could be propagated over the plane boundary between a vacuum (or an adequately rarefied medium, air for example), ...

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit NAP.edu/10766 to get more information about this ...

Researchers in Europe have developed a technique for obtaining accurate laser-based measurements of objects hidden behind complex scattering structures. They say that their mathematical formula, which ...

On January 17, 2018, Hugo Vau was in the right spot at the right time to do what no other surfer had done before: Ride a wave measuring more than 100 feet in height. To the surfing world, that barrier ...

Researchers have demonstrated the ability to both excite and detect spin waves in a two-dimensional graphene magnet, but they couldn't measure any of the wave's specific properties. Now, researchers ...