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Albert Einstein's theory of gravity postulated more than a century ago Relativity, is here to stay and remains to this day "a reasonable way to understand the universe," says Discover Magazine .
This is because the gravity principle of Einstein has just been proved by another scientific study has shown that the theory of Einstein's relativity is still the same in distant galaxies – producing the same type of gravitational lenses as the predictions, Inquisitr reported – a new paper concludes once again that Einstein was right.
Published July 4 in the review Na ture this new study focused on another prediction of general relativity known as the "Principle of Strong Equivalence".
Feather, Hammer, Neutron Star
This principle asserts that gravity affects all objects. in the same way, even the most massive of them, which should fall at the same rate as the lighter objects in the absence of air, under the effect of gravitational forces.
Although surprising, the principle of equivalence was tested several times on Earth – and even on the moon in 1971, during the Apollo 15 mission, note Science Daily – each times with the same result: that all objects fall in the same way, regardless of their mass and weight, if you take the air resistance out of the equation.
Einstein's theory of gravity passes the most difficult test to date https://t.co/lI5rONc1kb pic.twitter.com/AmHZnqRWOj
This is why the famous hammer and feather experiment performed on the moon by Apollo 15 astronaut David Scott saw the two objects hit the lunar earth in same time, note Space.com .
Now, almost 80 years later, a study e conducted by researchers from the University of Amsterdam in the Netherlands has proved that even extremely massive objects, such as superdense neutron stars, fall like a feather. Here's how they did it
Perfect & # 39; Laboratory & # 39;
The opportunity to test Einstein's gravity theory on extremely massive objects was discovered in 2011 with the discovery of a triple-star system called PSR J0337 +1715, detected at 4,200 light-years from our planet, in the direction of the constellation of Taurus.
Consisting of two white dwarf stars, this system also includes a pulsar – a super fast rotating neutron star, as reported by Inquisitr . This particular pulsar, which weighs 1.4 times the mass of our sun, but is only about the size of Amsterdam, the capital of the Netherlands, is in close orbit with one of the white dwarfs – a star of considerably weaker mass, of only 0.2 solar masses, but of larger proportions, about the size of the Earth.
Einstein astronomy magazine on the right: even the heaviest objects fall in the same way Astronomy Magazine Albert Einstein has had a few weeks! First of all his thought experiment "imaginary lift" was confirmed with unprecedented accuracy, then … https://t.co/hZsz64Xl3f pic.twitter.com/92u3j5bQzu [19659003] – Hurshal (@Hurshal) 5 July 2018
The couple is engaged in a 1.6 day orbit, while orbiting together around the other white dwarf further away every 327 days
] According to the co-author of the study, Ryan Lynch, of the Green Bank. Observatory in West Virginia, these unique conditions provide the ideal transit area for the ultimate gravity experience.
"It is a unique star system, we do not know of others like that, it makes it a unique laboratory for testing theories. from Einstein. "
The team kept their eyes on the pulsar for about six years, observing it with three giant telescopes: the National Science Foundation (NSF) Green Bank Telescope (GBT) , who has also discovered the three-star system, the Westerbork Synthesis radio telescope in the Netherlands, and the NSF Observatory in Arecibo, Puerto Rico.
The Principle of Strong Equivalence This One & # 39;
The GBT alone spent more than 400 hours observing the pulsar, carefully watching the radio waves emitted toward the Earth by superdense neutron star while it turns 366 times per second. Because the star rotates at incredibly fast speeds, the resulting continuous radiation appears as a series of regular pulses seen from Earth – hence the name "pulsar".
"We can explain every pulse of the neutron star we started our observations," says Anne Archibald, author of the main study, University of Amsterdam and of Dutch Radioastronomy Institute. "We can say its location a few hundred meters away. This is a very accurate track of where the neutron star has been and where it is going. "
The six-year study of these pulses showed that the distant white dwarf has the same gravitational effect on the pair of stars in orbit, despite their obvious difference in mass.
phenomenally, dense neutron stars fall like a feather https://t.co/YeqSigFbIt
following the orbits of the stars in a system – 2 white dwarf stars & 1 ultra-dense neutron star – the researchers determined that the "strong equivalence principle" passed its most stringent test pic.twitter.com/nfIprcF3po– George M ???????? (@EXDE601E) July 4, 2018
In other words, the heavy pulsar and its lighter white dwarf companion maintain the same path around the outer star of the system, which proves that the principle of 39; strong equivalence applied in their
If this principle was incorrect, the pulsar and the dwarf white would accelerate at different speeds, reflecting a distortion in the pulsar radiation, which would be detected at a different rate by our telescopes.
It turns out that the telescopes did not detect any difference in the acceleration of the two stars, confirming the strong equivalence principle and proving that the theory of gravity of the two stars was not the same. Einstein is correct.
"If there is a difference, it is nothing more than three parts in a million," notes Nina Gusinskaia, co-author of the University of Amsterdam [19659031Sincetheteam'smeasurementsare10timesmoreaccuratethananyothergravitationaltestthealternativegravitationaltheorieswhichproposethathighlycompactobjects(likethepulsarinPSRJ0337+1715)shouldfalldifferentlyfromtheobjectsofthelessmass(likeitswhitedwarfcompanion)becauseoftheirgravitationalbindingforce-thegravitationalforce
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