Mars is it possible?
BySpace X and Boeing Starliner are changing how travel occurs by using liquid fuel instead of solid fuel.
The changes are: using pressure fed engines, using propellant what burns on contact for no need of ignition which makes it quick and reliable, and making the rocket potentially reusable.
They are better than traditional ones because of it having the ability to steer better, being able to handle temperature cycling in the ISS, and it can also potentially boast the ISS.
The Challenge I see because of their trying for it to be “more affordable”, is the increase of mining to keep up with the cost, which can increase Global warming and not only from the smoke it produces from launch. There is a possibility that the trash left from rockets will still be able to stay in the atmosphere.
The potential is that they can land on Mars, start a colony, which they find a way to create rocket fuel to bring them back on Mars.
I would personally not visit Mars until getting there and staying there for a short while safe is an absolute guarantee, though I still wish to stay on Earth as the trouble astronauts have to go through in space with the radiation and bone degrading that can be caused is not my cup of tea.