This has been bothering me. As you will know, when something reaches the speed of light, its speed in time slows down. So I have been wondering, if we were to develope intersteller light speed travel and could move at the speed of light we would reach proximus Centuri in 4.3 years. But... time would proceed faster than the person going at light speed. So if it took four years for them, it would take millions of years for the people on earth. So what is the point, we would reach there faster if we were in the machine, but slower on earth. Explain why we would do this. And if I am right in saying this point.