We have already sent 2 probes outside the Solar System? Really, they were just arguing earlier this year if the first probe we sent has even exited our solar system yet. Additionally, it will lose all contact with us before it gets very far into interstellar space. We could probably sent out a ship that would take a very long time to reach another star system, but communication would take twice as long and it just not very feasible. We can't even feed and cloth everyone on this planet, much less send a bunch of people on a very long journey into the stars.