> Most of the interesting questions involve energies or distances way beyond what's reachable by experiment today. Astronomers can observe extremely energetic

> Most of the interesting questions involve energies or distances way beyond what's reachable by experiment today. Astronomers can observe extremely energetic environments from a great distance. It's not a controlled experiment, but sometimes they get lucky and see something that suggests new physics. I have no idea what might be needed to provide astronomical evidence for string theory.