Every now and then I like to write about the new perspectives of space travel and/or space colonization projects. It’s the new frontier since the ’60s and it will become the greatest challenge of human history in a few years from now.
So, here and here you may find what I’ve written before about this matters. Today is about engines, three very different concepts about what we could use to put people and hardware in the direction of Mars and beyond. Everything is still in the concept phase and one of the concepts is quite strange (on the edge of known physics), but what we need now is food for thought.