I was having a discussion with a colleague earlier today regarding exoplanet exploration. Being that the biggest challenge for mankind to travel to distant planets is that time dilation would make such an extreme effect that by the time we reached our destination thousands of years may have already passed on Earth, my thought was that the Voyager is traveling roughly 5% the speed of light currently and although the time dilation effects would be minimal at this speed, the radio communications are unaffected by the time dilation itself. My friend argued alternatively, saying that time dilation would affect the radio communication equally and would be greatly affected if a probe were moving close to the speed of light. So I suppose my question is this: Would it be entirely unreasonable to send probes to potentially habitable planets right now at close to the speed of light so that we don't have to waste a human life with such an incredible journey? My thought is that even though the probe is traveling this fast, it can still communicate with light waves (lasers, etc.) which are already moving at the speed of light, in which case time dilation wouldn't affect them...am I right here?