@Trilobyter

"None of the current space craft intended to ferry human beings back and forth to Mars are realistic fellow citizens.

And the problem is gravity.

Just imagine, because of the lack of gravity the occupants of the ISS must exercise for hours a day just to survive for a few months, and still return to Earth unable to walk.

A true interplanetary craft must create artificial gravity, and the only way we know to do that is via centrifugal force.

But the spaceships we see in movies, where there is some part that spins around another, are also unrealistic and unnecessary.

Unrealistic because such a craft would be unacceptably subject to mechanical failure, and unnecessary because all we need do is spin the entire ship.

However such a ship must be built in space, as the most simple and efficient shape is a wheel and could not be launched from Earth.

Think of it as a space station from a 1950s movie, tilted to the side with a rocket/ion engine in the center. The wheel would spin to create gravity as the engines propelled it towards its destination.

Primitive interplanetary travel can and must be accomplished now my friends.

But thus far we are pursuing a path destined for certain failure."
SearingTruth