Although man has successfully landed in the universe, the universe is still very big. At present, scientists have observed that the universe has been expanding, which is actually due to many reasons, among which several key reasons are that the combination of radiation and cryogenic cooling effects with the energy of dark matter makes the universe expand continuously.

First of all, we still need to understand what the expansion of this universe means. Simply put, the area of the universe is still expanding, just like the ocean is expanding. The expansion of the universe has many functions, such as the density of matter will decrease, the area will increase, and the number of black holes will be greatly affected; So scientists began to explore what caused the expansion of the universe, and finally successfully locked in three reasons, that is, radiation, low temperature and dark matter energy. Although the sun keeps burning in the universe, the temperature is still very cold, and even some planets are extremely low all year round.

Radiation is ubiquitous in the universe, which is very harmful to living things and may lead to gene mutation and so on. Therefore, the astronauts selected by each country have gone through layers of selection, and then continue to train before they can go to the universe, but after returning, their bodies will still be affected by various aspects; Radiation will lead to the constant dilution of the universe. Diluted at this time, combined with the very low temperature in the universe, the universe will continue to expand, just like a mass of ice melts and then becomes larger, and then becomes ice in a cold environment, and the area will naturally expand a lot.

Another key factor is dark matter, which scientists think is a cosmological constant. Simply put, the energy of the universe itself is equivalent to the innate property in the novel, which can provide energy for these diluted environments, thus ensuring the continuous expansion of the universe.