No time? Research shows that the expansion of the universe is slowing down and will begin to collapse in 100 million years

Physicists tell us that everything in the universe is in eternal motion, ranging from extranuclear electrons to the entire universe.But the motion of the universe itself seems not simpleIn the 1920s, Edwin Hubble found that after the conclusion that "most galaxies in the universe are far away from the earth" was reached by measuring the spectral data of extragalactic galaxies, the previous stable universe model was broken, and the size of the universe was no longer static.Even Einstein deleted the "cosmological constant" used to maintain the stability of the universe in the theory of relativity because of Hubble's discovery, and went to the Mount Wilson Observatory to observe the expansion of the universe himself.But the common sense of physics tells us that the universe cannot expand forever, because according to the big bang theory, the biggest source of the expansion of the universe is the force of the big bang, but this force will obviously decay with the passage of time. Today, 13.82 billion years after the big bang, only 93 billion light-years of the observable universe diameter, The expansion speed of the universe is supposed to decay or even change from expansion to collapse.However, the observation results surprised everyoneIn the 1990s, physicists Saul Perlmutter, Brian Schmidt and Adam Rees discovered an amazing fact when observing La type supernovae: the speed and redshift value of this kind of supernova, known as the cosmic rangefinder, far from the earth are not consistent with those of more recent supernovae, but show a trend of accelerating away from the earth.This trend means that the speed of the expansion of the universe is not constant, and the speed of celestial bodies at different distances away from the earth is also different. The farther away from the earth, the faster the celestial bodies will be away from the earth. Therefore, the three physicists came to a conclusion: our universe is not expanding steadily, but is in accelerated expansion.The discovery of the accelerated expansion of the universe finally won the three physicists the Nobel Prize in physics in 2011. However, the scientific community is still studying various aspects of the expansion of the universe.A recent paper published in the proceedings of the National Academy of Sciences of the United States believes that dark energy, which accounts for 73% of the total mass and energy of the universe, is not static and will change with the passage of time, thus affecting the expansion rate of the universe.The universe expansion model in the paper shows that the accelerating expansion of the universe caused by the dark energy in the universe at this stage is about to stop, because the repulsive force provided by the dark energy is rapidly decaying, and it will not be able to overcome the gravitational force immediately, so that the universe will continue to accelerate its expansion. Therefore, the expansion rate of the universe has started to slow down at least several million years ago.According to the results of model deduction, our universe will stop accelerating expansion after 65 million years and turn to a constant expansion rate. In 100 million years, dark energy will be completely in the downwind and will no longer be the opponent of gravity.Therefore, in 100 million years, our universe will change from the current accelerated expansion to collapse. All galaxies will show a blue shift in the spectrum. Galaxies far away from the earth will also start to approach the earth. Just like the previous universe accelerated expansion under the action of dark energy, the future universe will also accelerate collapse under the action of gravity.At that time, the farther away galaxies are from the earth, the faster they will approach the earth. Those galaxies that lost contact with the earth when they expanded to 46.5 billion light-years away will gradually retreat and establish a causal relationship with the earth again.But collapse is not necessarily a good thingBecause if the universe collapses without limit, the distance between galaxies will become closer and closer, and the collision frequency of galaxies in the whole universe will become more. In the long run, galaxies in the universe will merge into one large galaxy, and these large galaxies will eventually become one galaxy because of the collapse of the universe.In the end, stars will be squeezed together because of the collapse of the universe, and even all atoms in the universe will be squeezed together. All substances in the universe will eventually return to the singular point state, and then there will be another big bang, which will explode a new cosmic law and a new cosmic intelligent civilization.searchuniverseHawking made three predictions before he diedWill mankind still exist after 100 million yearsHow terrible is the end of the universeWill the earth change in 2023How fast is 13 trillion times the speed of light