Hubble’s 15th Anniversary of Servicing Mission 4

Fifteen years ago, human hands touched NASA’s Hubble Space Telescope for the last time.
Today, more than three decades after its launch in 1990, Hubble continues to send stunning images back to Earth and conduct groundbreaking science. Much of the credit for the last 15 years belongs to Servicing Mission 4 (SM4), the fifth mission to repair and upgrade the telescope.