LIGO and Virgo resume search for ripples in space and time

The National Science Foundation's LIGO (Laser Interferometer Gravitational-Wave Observatory) is set to resume its hunt for gravitational waves—ripples in space and time—on April 1, after receiving a series of upgrades ...

Pollution: New ammonia emission sources detected from space

Researchers from the CNRS and the Université Libre de Bruxelles (ULB) have prepared the first global map of the distribution of atmospheric ammonia (NH3) by analyzing measurements taken by satellites between 2008 and 2016. ...

Gravitational waves from a merged hyper-massive neutron star

For the first time astronomers have detected gravitational waves from a merged, hyper-massive neutron star. The scientists, Maurice van Putten of Sejong University in South Korea, and Massimo della Valle of the Osservatorio ...

Gravitational waves could shed light on dark matter

The forthcoming Laser Interferometer Space Antenna (LISA) will be a huge instrument allowing astronomers to study phenomena including black holes colliding and gravitational waves moving through space-time. Researchers from ...

Lasers in space—Earth mission tests new technology

Imagine standing on the roof of a building in Los Angeles and trying to point a laser so accurately that you could hit a particular building in San Diego, more than 100 miles (160 kilometers) away. This accuracy is required ...

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Interferometry

Interferometry is the technique of diagnosing the properties of two or more lasers or waves by studying the pattern of interference created by their superposition. The instrument used to interfere the waves together is called an interferometer. Interferometry is an important investigative technique in the fields of astronomy, fiber optics, engineering metrology, optical metrology, oceanography, seismology, quantum mechanics, nuclear and particle physics, plasma physics, and remote sensing.

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