How does the LIGO detect gravitational waves?

How does the LIGO detect gravitational waves?

When a gravitational wave passes by Earth, it squeezes and stretches space. LIGO can detect this squeezing and stretching. Each LIGO observatory has two “arms” that are each more than 2 miles (4 kilometers) long. The observatory uses lasers, mirrors, and extremely sensitive instruments to detect these tiny changes.

How accurate is LIGO?

Most sensitive: At its most sensitive state, LIGO will be able to detect a change in distance between its mirrors 1/10,000th the width of a proton! This is equivalent to measuring the distance to the nearest star (some 4.2 light years away) to an accuracy smaller than the width of a human hair.

What is LIGO detector and the observation of gravitational waves?

The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory designed to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool.

Why does LIGO consist of two observatories?

LIGO was designed with two detectors so far apart for good reason. LIGO’s detectors are so sensitive that they can ‘feel’ the tiniest vibrations on the Earth from sources very nearby to sources hundreds or thousands of miles away.

Who paid for LIGO?

NSF
LIGO is funded by NSF and operated by Caltech and MIT, which conceived of LIGO and led the Initial and Advanced LIGO projects.

What is the basic principle behind LIGO?

Gravitational waves cause space itself to stretch in one direction and simultaneously compress in a perpendicular direction. In LIGO, this causes one arm of the interferometer to get longer while the other gets shorter, then vice versa, back and forth as long as the wave is passing.

Where are the LIGO detectors located?

The two primary research centers are located at the California Institute of Technology (Caltech) in Pasadena, California, and the Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts. The detector sites in Hanford and Livingston are home to the interferometers that make LIGO an “observatory”.

Did LIGO detect gravitational waves?

LIGO announced the first-ever observations of gravitational waves in 2016 and has now spotted a total of 12 gravitational signatures of pairs of enormous objects smashing together. LIGO made the find in collaboration with the Virgo gravitational wave observatory in Italy.

Why was LIGO created?

LIGO is designed to detect the gravitational waves released when two neutron stars or black holes spiral into each other or when a stellar core collapses and causes a Type II supernova.

Where are LIGO observatories?

What has LIGO discovered so far?

Since this first discovery, LIGO has detected other gravitational wave signals, also generated by pairs of spiraling, colliding black holes.

Can LIGO detect gravitational waves coming from below?

LIGO can also detect gravitational waves coming from any direction (even below)! A single LIGO detector could not initially confirm gravitational waves on its own. The initial discovery of gravitational waves required that similar signals arrive quasi-simultaneously in multiple detectors.

Why is LIGO important to physics?

Though its mission is to detect gravitational waves from some of the most violent and energetic processes in the Universe, the data LIGO collects may have far-reaching effects on many areas of physics including gravitation, relativity, astrophysics, cosmology, particle physics, and nuclear physics.

What does LIGO look like?

Each LIGO detector consists of two arms, each 4km (2.5 mi.) long, comprising 1.2m-wide steel vacuum tubes arranged in an “L” shape, and covered by a 10-foot wide, 12-foot tall concrete shelter that protects the tubes from the environment. LIGO can also detect gravitational waves coming from any direction (even below)!