FIRST DEEP GLIMPSE. “We once thought that the entire universe consisted of our Milky Way galaxy alone. The Hubble telescope changed that in 1924, when other far faint galaxies were glimpsed. Only in 1995 we had the first ever deep look into the universe, and later studies concluded 120 billion galaxies were in the observable universe, which has again been upgraded to trillions.”
https://youtu.be/O57DyNMRGY8