In Frank Herbert's 'Dune', the most valuable substance in the universe, essential for space travel and extending life, is known as:
- Kryptonite
- The Spice Melange
- Tiberium
- Unobtainium
Answer: The Spice Melange
The Spice Melange, found only on the desert planet Arrakis, is the focal point of politics, religion, and economics in the 'Dune' universe.