<human>:  Why is the Hubble Space Telescope called Hubble?
<bot>: The Hubble Space Telescope is named after Edwin Hubble. Edwin Hubble was an American astronomer who studied the universe in the late 19th and early 20th centuries. He is best known for discovering that the universe is expanding. The Hubble Space Telescope was launched into space in 1990 and is still operating today.