:
|
Anti-matter has the same problem as the universal solvent, and solar sails can only take you in one direction.
|
what is universal solvent? a one way trip with solar sails could still be used to send probes to the near by stars, and when you get to a near by star the solar wind would be changed and they could head back, although I here they plan to use lasers as a booster so coming back would take a lot longer, and the overall trip would be too long to actually send a person.