Universe

Scientists detect gravitational waves from deep space

In only four months researchers have traced gravitational waves from the depths of the universe. In February 2016, the first was the last evidence validity of the general theory relativity. Now, astronomers laid up again. Again I confirmed Albert Einstein, 100 years ago predicted the existence of these mysterious waves.

Curiously had the global Guild of gravitational wave hunters at the announcement in the February 2016 already strong hints of another similarly spectacular cosmic event. But they decided to keep this secret, were to the measuring results. Now they have presented their results yesterday at the annual meeting of the American Astronomical Society in San Diego.

Cosmic Christmas gift

It happened at 04:38:53 CET on 26 December 2015: exactly in this second space-time trembled in Livingstone in the American Louisiana, only 1.1 milliseconds later the space and time rippled to 3000 km northwest Hanford in Washington State.

LIGO
Artwork black holes: right the two black holes of 8 and 14 solar masses are pictured, which together are cracked approximately 1.5 billion years ago. The gravitational waves resulting from this event could be detected now. Right, a black hole is so hard to see, such as 29 Sun that does with an other 36 fold solar mass black hole. While the energy was broadcast by three solar masses in the form of gravitational waves. These have been identified: first was that Einstein’s theory of relativity confirmed in practice. Photo: LIGO

The two LIGO detectors are available in these two places. These are each four kilometers long tubes, which are at right angles to each other in the ground. Gravitational waves hitting the Earth, so you can change the length of these two tubes by fraction of an atom diameter. And researchers can capture this tiny change with laser light.

Measured 27 orbits

There were two black holes of 8 and 14 solar masses, which cracked into each other about 1.5 billion years ago. Overall, 27 times around each other before they finally merged. A full second Astro researchers were able to follow the spectacular cosmic dance. The mass of an entire Sun was broadcast in this cosmic crash in the form of gravitational waves energy into space.

“Because of their mass lower compared to the first observation they spent more time in the sensitive area of the detectors, about a second”, the scientific LIGO spokeswoman Prof. Gabriela González reported from Louisiana State University. “It is a promising start to map out the populations of black holes in our universe.”

The first decisive signal had gone the Astroforschern on 14 September 2015 in the network. It was reverberation of a huge crash in the universe, about 1.3 billion years ago. A black hole so heavy as 29 Sun, collided with another black hole with 36 fold solar mass way to the real gravitational Astronomy”

So there is to celebrate the next sensation: “With this second observation, we really are on the way to the real gravitational Astronomy”, stresses also the German gravitational waves pioneer involved in the LIGO Prof. Karsten d. Hall, Director of the Albert Einstein Institute (AEI), the Max Planck Society in Hanover.

His heart is the exhibition with the laser system
One of the detectors by Ligo laboratory, which extends its four kilometre long arms in Livingston (U.S. State of Louisiana). His heart is the exhibition with the laser system. The second, virtually identical LIGO detector located in the approximately 3000 km away Hanford (Washington). Photo: LIGO laboratory

We can start now, to explore a variety of sources on the unknown dark side of the universe”, underlines Danz man, who directs the Institute for gravitational research, the Leibniz University of Hanover. The hunt goes on for gravitational waves.