Science

Although ultra-pure water does not exist in nature, humans can prepare it themselves

Scientists using modern observation equipment have determined the size, position, distance and other data of most of the objects in our galaxy

The "four great beasts" of physics actually exist only in thought experiments, and their proposal helps to develop and improve the relevant theories

Everything we can see in the universe has an internal structure and they are all made up of smaller matter, so what is the smallest matter in the universe?

The reason we don't see time travelers is actually because they are not in our timeline

The more "nucleons" an atomic nucleus contains, the greater its mass, but scientists have found that the average mass of the "nucleons" of different elements is different

A rigorous discussion of the unknown is not possible, so it is necessary to narrow down the universe we are discussing to only the universe we can see

The energy released by nuclear fusion is actually an important basis for stars to be able to maintain their stability

The solar system is a system of celestial bodies kept in motion by the sun's gravity, which means that all bodies within the effective range of the sun's gravity are part of the solar system, so by this definition, how large is the solar system?

The universe is so unimaginably large that even if humans were able to travel at infinitely close to the speed of light, they would not be able to penetrate its mysteries. Fortunately, the speed of light is not the speed limit of the universe, so it is entirely conceivable that in the distant future, humans may somehow be able to escape the shackles of the speed of light.