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Washington - Einstein's Gravitational Waves Detected In Scientific Milestone

Published on: February 11, 2016 10:58 AM
By: Reuters
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 Head of Einstein Archives Dr. Roni Gross of the Hebrew University presents the original 100 years old documents of Einstein's prediction of the existence of gravitational waves at the Albert Einstein Archives of  the Hebrew University in Jerusalem, Israel, 11 February 2016. The US National Science Foundation is hosting a gathering of scientists from Caltech, MIT and the LIGO Scientific Collaboration to update the scientific community on efforts to detect gravitational waves.  EPA/ABIR SULTAN Head of Einstein Archives Dr. Roni Gross of the Hebrew University presents the original 100 years old documents of Einstein's prediction of the existence of gravitational waves at the Albert Einstein Archives of the Hebrew University in Jerusalem, Israel, 11 February 2016. The US National Science Foundation is hosting a gathering of scientists from Caltech, MIT and the LIGO Scientific Collaboration to update the scientific community on efforts to detect gravitational waves.  EPA/ABIR SULTAN

Washington - Scientists said on Thursday they have for the first time detected gravitational waves, ripples in space and time hypothesized by physicist Albert Einstein a century ago, in a landmark discovery that opens a new window for studying the cosmos.

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The researchers said they detected gravitational waves coming from two black holes - extraordinarily dense objects whose existence also was foreseen by Einstein - that orbited one another, spiraled inward and smashed together. They said the waves were the product of a collision between two black holes 30 times as massive as the Sun, located 1.3 billion light years from Earth.

The scientific milestone, announced at a news conference in Washington, was achieved using a pair of giant laser detectors in the United States, located in Louisiana and Washington state, capping a long quest to confirm the existence of these waves.

The announcement was made in Washington by scientists from the California Institute of Technology, the Massachusetts Institute of Technology and the LIGO Scientific Collaboration.

Like light, gravity travels in waves, but instead of radiation, it is space itself that is rippling. Detecting the gravitational waves required measuring 2.5-mile (4 km) laser beams to a precision 10,000 times smaller than a proton.

The two laser instruments, which work in unison, are known as the Laser Interferometer Gravitational-Wave Observatory (LIGO). They are able to detect remarkably small vibrations from passing gravitational waves. After detecting the gravitational wave signal, the scientists said they converted it into audio waves and were able to listen to the sounds of the two black holes merging.

“We’re actually hearing them go thump in the night,” MIT physicist Matthew Evans said. “We’re getting a signal which arrives at Earth, and we can put it on a speaker, and we can hear these black holes go, ‘Whoop.’ There’s a very visceral connection to this observation.”

The scientists said they first detected the gravitational waves last Sept. 14.

“We are really witnessing the opening of a new tool for doing astronomy,” MIT astrophysicist Nergis Mavalvala said in an interview. “We have turned on a new sense. We have been able to see and now we will be able to hear as well.”

The LIGO work is funded by the National Science Foundation, an independent agency of the U.S. government.

Einstein in 1916 proposed the existence of gravitational waves as an outgrowth of his ground-breaking general theory of relativity, which depicted gravity as a distortion of space and time triggered by the presence of matter. But until now scientists had found only indirect evidence of their existence.

OPEN THE DOOR

Scientists said gravitational waves open a door for a new way to observe the universe and gain knowledge about enigmatic objects like black holes and neutron stars. By studying gravitational waves they also hope to gain insight into the nature of the very early universe, which has remained mysterious.

Everything we know about the cosmos stems from electromagnetic waves such as radio waves, visible light, infrared light, X-rays and gamma rays. But because such waves encounter interference as they travel across the universe, they can tell only part of the story.

Gravitational waves experience no such barriers, meaning they can offer a wealth of additional information. Black holes, for example, do not emit light, radio waves and the like, but can be studied via gravitational waves.

Scientists sounded positively giddy over the discovery.

“It is really a truly, truly exciting event,” said Abhay Ashtekar, director of Penn State University’s Institute for Gravitation and the Cosmos. “It opens a brand new window on the universe.”

“The LIGO announcement describes one of the greatest scientific discoveries of the past 50 years,” Cornell University physicist Saul Teukolsky added.

Ashtekar said heavy celestial objects bend space and time but because of the relative weakness of the gravitational force the effect is miniscule except from massive and dense bodies like black holes and neutron stars. He said that when these objects collide, they send out ripples in the curvature of space and time that propagate as gravitational waves.

The detection of gravitational waves already has provided unique insight into black holes, with the scientists saying it has demonstrated that there are plenty of black holes in the range of tens of solar masses, resolving the long debated issue of the existence of black holes of that size.

A black hole, a region of space so packed with matter that not even photons of light can escape the force of gravity, was detected for the first time in 1971. Scientists have known the existence of small black holes and so-called supermassive black holes are millions or billions of times as massive as the sun, but had debated the existence of black holes of intermediate size.

Neutron stars are small, about the size of a city, but are extremely heavy, the compact remains of a larger star that died in a supernova explosion.



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Read Comments (5)  —  Post Yours »

1

 Feb 11, 2016 at 11:29 AM ayoyo Says:

This is what we accomp;ish while the moslems are only destroying as much as the can get their hands on.

2

 Feb 11, 2016 at 11:31 AM Adopt A Job Says:

You see if only charedim would put their head to it they can be very successful. Under the new shrieklicha Lapid law, anyone currently over 24 (at the time the law was passed) can go to work with no army service. That's right zero army service. So why are our struggling charedim over 24 not working? Why are we "adopting kollels"? Why not adopt jobs programs, college courses etc...?

3

 Feb 11, 2016 at 01:11 PM Anonymous Says:

Reply to #2  
Adopt A Job Says:

You see if only charedim would put their head to it they can be very successful. Under the new shrieklicha Lapid law, anyone currently over 24 (at the time the law was passed) can go to work with no army service. That's right zero army service. So why are our struggling charedim over 24 not working? Why are we "adopting kollels"? Why not adopt jobs programs, college courses etc...?

Why? Because Ki Heim Chyeinu UVAHEM NEGEH YOMOM VELAYLO that's why

4

 Feb 11, 2016 at 03:08 PM Yidden Says:

They detected it on September 14 2015. That was on Rosh Hashanah!!!

5

 Feb 11, 2016 at 04:08 PM #2 Says:

Reply to #3  
Anonymous Says:

Why? Because Ki Heim Chyeinu UVAHEM NEGEH YOMOM VELAYLO that's why

Yes of course nobody is denying that torah is the ikkur and its our life. yes its ki heim chyeinu. But hashem wants us to work the land to. This is especially if our children are starving as in EY. Never since moshe rabbenu did we have such a notion that kllal yisroel is a whole must learn. A society as a whole must work. That does not mean work is the ikkur and torah is still chayinu.

6

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