Did you reconfigure the rockets to fly toward their destination?
You needed Science 55+ to do so - and just before you launched them.
That's not what it says at all.
It states you can reprogram the rockets to land 15% closer to their destination. Assuming they're going to another planet, 15% could mean the difference between landing into their destination or into a world with an atmosphere that would kill them the moment they left the ship. Or it could simply mean you got them killed by setting the destination to a star.
Basically, you don't see the results of their voyage, assuming you didn't sabotage it. For all we know, they could be in China.