When it comes to space exploration, energy supplying is surely one of the most limiting issues. Our Sun is the largest energy source in our solar system and probably will stay unrivaled for the next several centuries. The amount of power it radiates is daunting, and being able to manage even a fraction of it would enable a huge step forward in space exploration and exploitation.

All these ideas are fine for intra-solar system travel, but woefully inadequate to interstellar travel.  To read more, click here.