The key to space is genetics. If we can master modifying our own code, we can solve all of the uncomfortable aspects of space travel (radiation, low/zero gravit

The key to space is genetics. If we can master modifying our own code, we can solve all of the uncomfortable aspects of space travel (radiation, low/zero gravity, habitable environments※). With extreme longevity you can even get over the time aspects (If a human can live for multiple centuries, a few decades spent on travel isn't that much time). ※ No need to terraform - instead of adapting the planet to humans, adapt humans to the planet. Scarce atmosphere? Add the Nepalese genes to survive at high altitude[1]. Heavy gravity? Increase bone and muscle mass. Water world? Gills it is! [1] https://www.sciencemag.org/news/2014/07/tibetans-inherited-high-altitude-gene-ancient-human https://www.sciencemag.org/news/2014/07/tibetans-inherited-h...