About the motion of stars?

The change of constellation shape is not only reflected in space, but also in time. We can not only see the deformation of constellations by changing the perspective, but also observe the changes of their shapes as long as we wait long enough. Stars sometimes form clusters and run together in groups. Sometimes a star rushes alone, leaving the original constellation and heading for another new constellation. In a few cases, a member of a binary system will explode, thus getting rid of the shackles of mutual gravity and rushing into space at its inherent orbital speed. In addition, stars also have a process of life and death, evolution and development. If we observe for a long time, we will see the appearance of new stars and the death of old stars. In other words, the images in the starry sky are slowly melting and changing.

Even in the millions of years of human existence, the constellations have been changing. Take the figure of the Big Dipper or Ursa Major as an example. With the help of computers, we can transcend the boundaries of time and space and pull the Big Dipper back to its state 654.38+0 million years ago. People can find that the Big Dipper at that time was very different from what it looks like now, not like a spoon, but more like a spear. If the time machine suddenly takes you back to the distant unknown past, you can roughly judge your age according to the shape of the constellation. If the Big Dipper is shaped like a spear, it must be the Middle Pleistocene.

We can also let the computer go back to the past and predict the future constellation images. Take the constellation lion as an example. The zodiac is made up of 12 constellations, which are like a belt winding the sun's trajectory in the sky every year. Zodiac and Zoo have the same root, because the constellations in the zodiac, like lions, are mostly named after animals In another 654.38 billion years, the constellation Leo will be even less like a lion than it is now. Perhaps, our descendants will call it the radio telescope constellation. However, I guess radio telescopes may be more outdated than Shi Mao now.