Thorium vehicle will run 100 years on 8 grams of fuel

[longship]

9. Voyager has shut down its cameras. Long ago.

And the reaction wheels on the Kepler space telescope failed in four years. (Two of the four, enough to terminate the project.)

Moving parts are not good in space.

And you're right, ion drive takes a bit of energy. It's a cool way to do things. But it still has to obey the rocket equations and when you're out of fuel, you're out of fuel.

That's why people are looking at solar sails and interstellar hydrogen ramjets. I like the latter one. Cool stuff. But that's for another century, probably.

Alas, no warp drives, probably ever. I am sorry Commander Scott.

But captain! The Sterling engine canno take it much longer!