Modern science believes that our universe originated from a big bang of singularity. After the big bang, the universe began to expand outward. When people went out of the earth to explore the universe, they discovered the expansion of the universe. In fact, it is not too difficult to observe the expansion of the universe. By observing the distant galaxies farther and farther away from the solar system, scientists can indirectly prove that the universe is expanding.
According to a new research report recently released on the official website of NASA, the newly measured cosmic expansion speed based on the data of Hubble Space Telescope is about 10% faster than the speed predicted by Planck satellite of Europe by measuring cosmic microwave background radiation.
In the late 1990s, Reese and others discovered that the universe was expanding at an accelerating rate, and won the 2011 Nobel Prize in physics. It is not clear what causes the accelerated expansion of the universe. Some astronomers believe that the “behind the scenes” is dark energy.
Using the Hubble Space Telescope, Reese’s team observed 70 Cepheid variables in the Large Magellanic Cloud (LMC), one of the Milky Way’s satellite galaxies. Cepheids darken and brighten at a predictable rate, so they are used by scientists as “standard Candlelight” to measure the distance of the universe. They used this information to calculate the current expansion rate of the universe, the value of Hubble constant, which is 74.03 km / (s · million s gap). The million second gap (MPC) is about 3.26 million light years.
New observations by scientists show that our universe is accelerating expansion, which makes many scientists confused. According to the truth, the expansion speed of the universe should be reduced after its birth 13.8 billion years ago. But why is the expansion speed of the universe accelerating instead? What causes the accelerated expansion of the universe? Will the universe keep expanding?
Scientists have put forward three possible explanations for the accelerated expansion of the universe. One possibility is that a kind of “early dark energy” appeared soon after the big bang, which made the expansion of the universe faster than expected; the other possibility is that the universe contains a new subatomic particle – Dark radiation (including neutrinos, etc.), whose moving speed is close to the speed of light; the third possibility is that The interaction between dark matter and ordinary matter is stronger than previously assumed.
However, in recent years, with the in-depth study of dark matter and dark energy, more and more scientists have realized that dark matter and dark energy are the dominators of the universe. All the laws and rules of the universe may have a lot to do with dark matter and dark energy, so the expansion of the universe may also have a lot to do with dark energy.
Dark energy is the main energy of the universe, under its effect, there is a stable and orderly cosmic environment, but the human cognition of dark energy is still in the theoretical stage, almost a blank. Apart from knowing that there are a lot of dark matter and dark energy in the universe, we know nothing about their properties and characteristics. At present, human beings have not really collected dark matter or dark energy in the universe.
If the expansion of the universe is dominated by dark energy, will the expansion of the universe continue to accelerate as long as dark energy exists? Scientists have no answer to this question. Now we know nothing about the relationship between cosmic expansion and dark energy. However, the accelerating expansion of the universe is not good news for human exploration of the universe.
You know, the universe is vast. When the universe was just born, the distance between galaxies was relatively close. But with the continuous expansion of the universe, the distance between galaxies is getting farther and farther, and the expansion speed is very fast. Some scientists think that the expansion speed of the universe may exceed the speed of light. If so, human beings may never be able to reach the edge of the universe.
The expansion of the universe makes the distance between galaxies farther and farther. In the future, we will be able to see fewer and fewer stars, and the galaxies around the solar system will be farther and farther away from us. Of course, the universe is expanding, and human science and technology are also developing rapidly. In the future, when we have the ability to fly at the speed of light and beyond the speed of light, we will be able to explore further and further.
At the same time, astronomical telescopes and other observation equipment will become more and more advanced. Even though galaxies are gradually away from us, with more powerful observation equipment, we can still see them. As long as human science and technology develop fast enough, it is not impossible to observe the boundaries of the universe in the future.
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