The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It has made numerous groundbreaking discoveries in astronomy.
Examples
**Example:** Since its launch in 1990, Hubble has made over 1.5 million observations and helped determine the age of the universe to be 13.8 billion years. Its Deep Field images revealed thousands of galaxies in a tiny patch of seemingly empty sky.