According to the latest data from the Dark Energy Observatory, Professor Dai Zihai, an honorary professor of physics at Cornell University, calculated that the expected lifespan of the universe is about 33 billion years, and it is currently approaching the midpoint of this lifespan. In about 11 billion years, the universe will continue to expand to its maximum volume, then begin to contract, twisting like a rubber band, and eventually converging into a point. After incorporating the new data into a model that includes the cosmological constant, Professor Dai arrived at the above conclusion. The cosmological constant was proposed by Einstein over a century ago and has been used by cosmologists in recent years to predict the future of the universe. Professor Dai stated that for the past 20 years, people have always believed that the cosmological constant is positive and that the universe will continue to expand forever. But new data seems to indicate that the cosmological constant is actually negative, and the universe will eventually face a 'great crisis'. At present, the universe has existed for 13.8 billion years and is in an expanding state. This research paper titled 'The Lifespan of Our Universe' was published in the British Journal of Cosmology and Astrophysics. Professor Dai pointed out in his paper that according to existing models, there are essentially two basic directions for the future of the universe: if the cosmological constant is positive, the universe will continue to expand infinitely in its current state; If the cosmological constant is negative, it will first expand to its maximum volume, then begin to contract, and eventually collapse to zero. The conclusion drawn by Professor Dai through the latest calculations is exactly the latter situation. Professor Dai pointed out in his paper that this' great crisis' signifies the end of the universe. According to its model calculations, it will occur in about 20 billion years. This year, the Dark Energy Survey project from Chile and the report released by the Arizona Dark Energy Spectrometer in the United States have brought significant progress to research. Professor Dai stated that the data results obtained from these two observation stations are highly consistent. He and his co researchers proposed a hypothesis in their paper: there exists a low-quality particle that exhibited properties similar to the cosmological constant in the early universe, but no longer possesses this characteristic. This simple model is highly consistent with observational data, while also tending towards negative values for potential cosmological constants. Professor Dai pointed out that there have been views before that if the cosmological constant is negative, the universe will eventually collapse, so this is not a new conclusion. But this model indicates when and how the universe will collapse. He added that more observations will be conducted in the future. Hundreds of scientists are measuring dark energy by observing millions of galaxies and their distances, collecting more accurate data to refine models. The dark energy spectrometer will continue to observe for one year. In addition, multiple observation projects are currently or will soon be launched, including the Zwicky Transient Research Facility in San Diego, the European Euclid Space Telescope, NASA's Cosmic History, Reionization Era Spectrophotometer and Ice Explorer projects, and the Vera Rubin Observatory. Professor Dai believes that the ability to quantitatively determine the lifespan of the universe is encouraging. Understanding the origin and end of the universe helps to gain a deeper understanding of the universe itself, which is the core goal of cosmology. He said, "Regardless of the form of life, we are curious about our 'starting point' and 'ending point'. For our universe, exploring whether it has a starting point is equally important. In the 1960s, we confirmed that the universe has a starting point. So the next question is: 'Does it have an ending point?' For many years, many people believed that the universe would exist forever. But now we know that if these observational data are confirmed, the universe will eventually come to an end." (New Press)