Hubble precisely measured the age of the universe. It found evidence of dark energy. It brought you images of distant galaxies in the young universe. And now, with the state-of-the-art instruments delivered by Servicing Mission 4 (SM4), the Hubble Space Telescope will look onto the universe with new eyes, surpassing even its previous vision.
Hubble was designed to be repaired and upgraded by astronauts, and these servicing missions have occurred several times since Hubble’s launch in 1990. SM4 has an ambitious program of activities. Over a series of five spacewalks, astronauts will replace worn-out telescope components, installing new batteries, new gyroscopes, a refurbished Fine Guidance Sensor, replacement thermal blankets, and more. It will significantly enhance Hubble's prowess with the installation of two new science instruments: the Wide Field Camera 3 and the Cosmic Origins Spectrograph. These upgrades will keep Hubble functioning at the pinnacle of astronomy well into the next decade.