I'm still trying to understand the concept of the slower passage of time at or near the speed of light. Say for example we had the technology to travel this fast and wanted to send astronauts to visit the newly discovered planet Proxima Centauri b four light years away. My understanding is that the journey would take four years from the perspective of an Earth-based observer, but the astronauts would only experience the passage of a few hours or days before arriving, thereby eliminating the need to bring along massive amounts of food and resources required to support multiple generations of space travelers. So basically if we can develop the technology to travel near the speed of light then we can send astronauts anywhere in the galaxy in a short period of time from their perspective (while of course thousands or millions of years on Earth pass). Is this thinking correct?