[ZOOKER]

Does this mean humans will never get star travel?

Not with any kind of reaction engine anyway. What we have now propels the craft forward by expelling reaction mass backward (equal and opposite). To exceed the speed of light you would need to expel mass at greater than the speed of light. I'm no rocket scientist, but I don't see how we can do that.

Guess we'll have to cheat in some sci-fi fashion, like harnessing wormholes or folding space...

[UCANSEE2]

I'm no rocket scientist, but I don't see how we can do that.

Use particles that have a negative mass.

[PT57A]

Even if you could propel the craft at > C using a reaction based system, the craft wouldn't survive the acceleration.

"Squish just like grape."