Possible Clues:

• Part of the Enterprise's power source
• Physicist's study
• Stuff that's the opposite of stuff
• A talk about time, missing energy and rarer stuff of the universe
• A talk about tiny boy - it's potentially explosive
• Concept of physics MIT put about in a casual talk
• Counterpart to everyday substance
• A boy comes in to chat — it's like nothing on earth
• You can't touch this
• Particle physics subject