Sagittarius galaxy _ Sagittarius galaxy cluster

Why did Hubble choose the Celestial Furnace constellation to shoot?

Dr Georgi said that the star constellation area was chosen for shooting because scientists have detected the distance between the earth and about 10000 galaxies in this area, and the time required for light to reach the Hubble telescope from these galaxies can be calculated accordingly. In this way, astronomers can know the shape of galaxies near the celestial furnace area from the beginning of the universe to 4.5 billion years. At present, the age of the universe is about 65.438+037 billion years.