Travel to the various stars in galaxy must use a navigation light...like a simulator laser light
The navigation light is curved....like a rope floating in space
With only the two ends being captured, called the source and destination positions
We must have to use the light because it is energy saving and not to be lost or accident
Space travel there must be a certain time like an airplane or train schedule.
light to interstellar will be similar numbers that tell the floor of the elevator
When both ends are in the position as calculated (It's like a moving and the lock fits in the machine)...it will make the journey to the target accurately