What do you find when you observe the night sky in the same place at different times?

Observing the night sky at the same place at different times will reveal the following:

Observe the night sky in the same place at different times, and you will find the stars moving. If you observe at the same time and place for a few days at night, you will find that the position of the stars has changed.

We can find a bright star as a reference. If one night at nine o'clock sharp, we see a bright star above the top of a big tree in the east. After half a month, we will see that the bright star is much higher than the treetops. This shows that the rising time of the stars is advancing day by day.

The movement of stars:

The fact is that every star we see moves. In fact, it is only after studying the motion of stars that astronomers realize that there is much more dark matter in galaxies than ordinary matter. Because of their existence, galaxies can have a stable structure, and this dark matter can also produce great gravity in our galaxy.

The Milky Way not only rotates, but also travels through space, and will collide with the Andromeda galaxy in the future. However, the relative velocity between these two galaxies is only 65,438+065,438+00 km/h, and since they are 2.5 million light years away, their collision will take about 4 billion years. As you can see, the space is really big.