[Pontiac]

“As a proposed precursor to interstellar travel, Lubin's concept has been met with a bit of skepticism due to some perceived flaws. For example, there is the question about deceleration once the low-mass probe approaches Mars

What good does it do you to get to Mars in 30 minutes if you are going to just sail right on by?

Lasers may be able to accelerate you to 25% of the speed of light but there is no laser on Mars to slow you down and no rocket on the spacecraft is going to do the job.

[Ozark Tom]

Any projectile at .25 lights is an up-rated version of a rail gun round.