A long way for space travel

The man is not yet ready for large-scale space travel as you can still see we can not send a human to Mars we can send probes in a trip of 2 years we could also send humans, I'll tell you what the reason The human body is not ready for the high exposure to weightlessness since the long exposure to it produces loss of bone mass in humans, if we send a human to Mars today during the 3 years of travel would arrive in very bad physical conditions (arthritis, osteoporosis, etc. ), The nasa scholars still do not find a solution to this problem since they have not yet found the method of pressurizing the cabins in space enough, now a new propulsion system is being searched fiercely to make the journey shorter. Tierra-Marte has investigated methods that we have only seen in works of science fiction that no longer seem to be science fiction, as propulsion by antimatter, propulsion by atomic explosion but that shows that still man should wait some time to step on other planets because although we send probes to any part of the galaxy we still do not find the materials necessary for the human race to cross the confines of space without any concern to expand the universe. I hope you like it.