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Scientists have conducted studies that concluded that gravitational waves emitted by a rare system – a hugely energetic pairing of a spiral black hole and a neutron star – can tell us the rate of the expansion of the universe by the Hubble constant.
Since the existence of the universe, he has trolled with him billions of stars and galaxies as he expanded. This has occurred since 13.8 billion years since the Big Bang.
A Precise Way to Measure the Hubble Constant
For many years, astronomers have relied on the positioning of certain stars and the speed of movement away from the earth to measure the rate of expansion of the universe, but accurate readings of these factors often resulted in different values of the constant.
Scientists at the Massachusetts Institute of Technology (MIT) and Harvard University have now come up with a way to measure the Hubble constant. This method suggests using gravitational waves emitted by a relatively rare system: a black-binary neutron star hole.
How Gravitational Waves Can Give More Accurate Results
According to the study published in the journal Physical Review Letters, as the objects in the circle of the universe one to the l & # 39; Another, they produce strong gravitational waves and finally, a flash of light when they collide.
This light can be an indicator of the speed of the system with which it is away from the earth, a more accurate and independent measure of the distance from the system.
Even though there is a scarcity of black hole neutron binaries, the researchers calculated that the detection of a few binaries should give the most accurate value possible for the Hubble constant.
Lack of information on Black Hole Neutron Star Binaries
Recently, the value of the Hubble constant has been measured using the Hubble Space Telescope from NASA and the US. Planck satellite of the European Space Agency and both had observations based on a star type known as the Cepheid variable, as well as on supernova observations
. These two measurements were extremely accurate but Their estimates of the Hubble constant Therefore, scientists are trying to rely on gravitational waves, even if the information is insufficient.
"Black hole neutron star binaries are very complicated systems of which very little is known." Salvatore Vitale, Assistant Professor at MIT
As scientists study the subject further, d & # 39; other methods are used to determine the expansion of the universe. 19659002] These methods include observations of fluctuations in the cosmic microwave background of the electromagnetic radiation that was left immediately after the Big Bang, while the methods of the electromagnetic radiation were not observed. universe was still in its infancy
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