Since the planet is very far, what we need is just a FAST SPACESHIP, more faster then the actual ones.

Let say that we want to reach Gliese 851c in one years. So its speed needed to be 20 time the speed of light.

In just two years of our life we could travel from the Earth to Gliese 581c and come back.

WOW! What are we waiting for ?

Well not so fast, not so fast. Slow down a bit.     Einstein taught us that:

Nothing can move faster then light"

and that light is always moving at velocity c=300.000 km/s with respect to everyone.

This seem at a first glance a bit disappointing

and at a second glance IMPOSSIBLE

How on Earth ....