We know that the Earth's orbit around the Sun is one year, and during this year, the four seasons of our Earth are formed. The solar system revolves around the center of the Milky Way with its own planets, and this cycle is called a galactic year. This galactic year is about 2500 million years. Similarly, during this galactic year, the solar system will experience four seasons similar to those of the Earth, which astronomers call the "Great Four Seasons."
So, the problem is, in the four seasons of the earth, we will experience environmental changes such as cold, heat, rain, snow, etc., and in the four seasons, the solar system, including the earth, will also experience different astronomical environments in various cosmic regions. It's just that the lifespan of our individual human beings, relative to 2The 500 million year cycle of the "Great Four Seasons" is too insignificant for us individuals to experience the overall environmental changes of the Great Four Seasons, even if there are 5,000 years of human civilization history left by the Messenger, and 2500 million years is just a moment.
I roughly did a math conversion if I put 2If the 500 million-year-old four seasons are compressed into one year on the earth, our individual human lifespan is 100 years, but it is equivalent to 10 seconds, and the 5,000-year history of human civilization is only 8 minutes. In 8 minutes, you won't feel too much change in the climate of the four seasons.
However, the fact that individual human beings and the history of human civilization do not "feel" the great four seasons does not mean that they do not exist. To a certain extent, human scientific research must be forward-looking and preventive, especially for issues such as the "Great Four Seasons", which are vital to the life and death of the entire human population.
According to the Great Four Seasons Hypothesis, the position and state of motion of the solar system in the Milky Way affect the climate and environment of the planets within the entire solar system. When the solar system is in different locations in the Milky Way, planets may experience different climate changes, including extreme climates such as extreme cold and heat. This periodic climate change could have a profound impact on life on planets, and could even lead to the extinction and re-evolution of life forms.
The risk factors brought by the four seasons to human beings are mainly as follows:
1.Magnetic storms: The solar system may experience powerful magnetic storms as it passes through a region of magnetic field in the Milky Way. These magnetic storms may have an impact on the planet's magnetic field, which in turn affects the planet's climate and ecology. For example, a strong magnetic storm may cause the stripping of a planet's atmosphere, exposing the planet's surface to space radiation and adversely affecting life.
2.Supernova explosions: Stars near the solar system may experience supernova explosions, which are extremely intense astronomical events. The energy and matter released by supernova explosions may have an impact on the solar system, including changes in planetary orbits, changes in atmospheric composition, etc. This impact can have a catastrophic impact on lives.
3.Influence of the center of the Milky Way: The solar system may be affected by the black hole at the center of the Milky Way and other celestial bodies as it revolves around the center of the Milky Way. These effects can lead to instability in the planet's orbit, as well as drastic changes in the planet's climate and environment.
4.Events within the solar system: Events within the solar system, such as gravitational interactions between planets, changes in planetary orbits, etc., may also have an impact on the climate and environment of the planets. For example, changes in planetary orbits can lead to drastic changes in planetary surface temperatures, which can affect the survival of life.
In addition, studies have shown that the earth's magnetic poles have reversed many times, which is also related to the four seasons.
In short, even modern science still knows nothing about many places in the solar system, let alone the universe outside the solar system, the sun is like a mother chicken, with her own chicks, a family in the vast and unpredictable universe "wandering", what kind of crisis will be encountered ahead, and where to go, can only say: the road ahead is long, and cherish it! Unless human beings complete the leap from cosmic type 1 civilization (planetary civilization) to type 2 civilization (stellar civilization), so as to break free from the confinement of this great season.