you missed my central question- do you think we know everythign there is to know about internstellar travel.
By all we know right now, yes- you are right. But I dont assume we know everything by a long shot.
FTL travel is impossible, but wormhole travel does not violate FTL.
Einstein's theory never actually said things couldn't go faster than light. It said things *with mass* couldn't be accelerated TO the speed of light or slowed down to the speed of light (if the object was somehow already traveling faster than light.), for it would take an infinity amount of energy to do either. Objects without mass (photons, gravity waves/gravitons, tachyons) can travel at light speed.