Guests: Mario Livo and John Bahcall.

Over the past fourteen years, the Hubble Space Telescope has added greatly to our knowledge of the universe, yet its future is in doubt. Unless a repair mission can be organized, Hubble will come to the end of its useful life in the next few years. Today on Focus, we're joined by Mario Livo and John Bahcall to talk about the efforts to keep Hubble going, as well as plans for the next-generation space telescope.