discussions today about what costs there would be to get to alpha centauri.
thing is, for the astronaut, the trip would seem shorter (timewise and spacewise) for them due to time dilation and length contraction. their mass would dilate too, but because of that, crashing into something would be catastrophic. they wouldn't be able to change direction either, not at that speed.
if they made it there and back, they would be younger than the people who were the same age as them when they left. costs would be enormous, especially for fuel, and our technology isn't that advanced. also, the idea is impratical because we wouldn't be able to communicate with them if they were travelling at the speed of light. not to mention it would still take years to travel there and back at that speed (around 8 both ways)
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