Assuming that it could survive the trip, attaching it to the station would make it almost unusable, says chief Hubble engineer John Grunsfeld. It captures such highly detailed images because it's free from any disturbances, atmospheric or otherwise. It's designed to stay very, very still. "Once its camera locks onto an object, it's unflinchable," Grunsfeld says. The vibrations of gear on the ISS would make such observations impossible.