On Saturday, April 24th, the Hubble Space Telescope will reach its 20th year in orbit. To mark the anniversary, we spoke to Ed Weiler, Chief Scientist for the Hubble mission from 1979 to 1998. He talked to us about the Hubble’s early days--its conception, its first years in space, and its infamous optical problems, which blurred its view until a repair mission replaced faulty cameras in 1993. Podcast produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. To learn more about the Hubble, go to pbs.org/nova/hubble