Beijing time September 2 news, according tomedia reports, we have long been used to use the position of the earth relative to the sun, to distinguish the year. However, while the Earth’s journey around the sun is important to humans on Earth, it is insignificant compared to the epic journey of the sun – and our entire solar system – around the center of the Milky Way for a week.
It takes about 220 million to 230 million Earth years for the sun to orbit the Milky Way, in other words, if we use the Milky Way “clock” to measure time, our Earth will only exist for about 16 years (in milky or cosmic years), and the sun will only form for 20 years, or even the entire universe for about 60 years.
The solar system orbits the Milky Way in a similar way to the Earth’s orbit around the sun. However, instead of orbiting a particular star, the solar system orbits a supermassive black hole at the center of the Milky Way, which has a huge gravitational pull on all matter in the Milky Way.
The sun travels very fast — about 230 kilometers per second, or 500,000 miles per hour — and the sun circles the center of the Milky Way so it doesn’t pull toward a black hole.
Our place in the Milky Way.
The Year of the Galaxy represents a larger unit of time than the Year of the Earth. But in the Milky Way, this unit of time is not uniform. What we on Earth call the Milky Way is relative to the position of the Earth in the Milky Way. We can say that the milky year is about 220 million or 230 million Earth years, but on other planets in the Milky Way, their Milky Way years are different.
The diameter of the Milky Way is about 100,000 light-years, and our Earth is 28,000 light-years from the center of the Milky Way. If you think of the Milky Way as a city, then our Planet is probably in suburban location, and if it’s a star in a transit orbit close to a “city center” black hole, the Milky Way is relatively short, but in the “suburbs”, where our solar system is located, the Milky Way is a little longer.
Similar rules apply to different planetary years. Mercury, for example, is the innerest planet in the solar system. Mercury orbits the sun for only 88 Earth days a week. Uatar, the seventh planet in the solar system, orbits the sun for 84 Earth years. Pluto, the distant dwarf planet, orbits 248 Earth years.
Although the physical mechanisms of planetary orbits are similar to those that shape the solar system’s orbit around the Milky Way, one question is worth asking: How did astronomers calculate the length of the Milky Way? In fact, this is a fairly basic science, in the early stages of the development of modern astronomy has been very clear.
Mainly to observe the motion of stars around the Milky Way, you can observe the motion of stars around the Milky Way, and then derive the length of the Milky Way years from the speed and direction of motion of other stars. (Han Lin)