[froh42]

If you can get any kind of spaceship up to speeds to reach other stars within reasonable time - you've got an amazing weapon. Just ram into something at full speed. Ok, if you have enough energy to correct course to aim, only.

[RangerScience]

It’s more than twice(1) as easy to make a rocket-propelled bullet than a rocket-propelled vehicle!

1) It’d be exactly twice as easy but for Tsiolkovsky!