The Elegant Universe author Brian Greene is back to guide viewers on another tour of space and time with this (inter)stellar four-part "Nova" documentary program. In addition to an exploration of the possibility that time itself may be an illusion, the program delves into what makes up "empty" space, quantum theory, and the nature of the impossible. 4 hrs. on two discs. Widescreen (Enhanced); Soundtrack: English Dolby Digital stereo.