Yes, according to Hawking, Penrose and other "smartest brains" on the basis of general relativity, the universe must have an end. There is only the question of whether the curvature is positive, negative or 0. If it is positive, the universe is closed (like a ball); Take 0, which is a plane; If it is negative, it is a crumpled plane, which is the so-called open universe. Now the scientific community generally believes that curvature is negative. 1929, Harvard discovered a strange phenomenon: all nebulae are getting farther and farther away from us. Some people think that the universe is football-shaped, expanding like a balloon, and some nebulae have left us. But at some point, the balloon will contract again and the nebula will come closer to us. Some people suggest that the universe is saddle-shaped, and it is like a saddle, constantly expanding to the four sides of the road. According to this explanation, in the distant future, the stars will gradually move away, the night sky will become monotonous and lonely, and people will hold different opinions and think that the universe is eternal. Although it will expand infinitely, new planets will be produced in the expanding space.