NASA is currently working on a “Journey to Mars,” a step-by-step process focused on getting human feet on the surface of the Red Planet by the 2030’s. It’s ridiculously exciting stuff, but there’s a lot of work to be done.
The International Space Station is the first step, where astronauts are even now testing the effects of space on the human body, communications capabilities, and other significant technologies. The next step is the Asteroid Redirect Mission, when the ARM robot will capture an asteroid mass and redirect it into a stable orbit around the moon. By 2025 or so, astronauts will utilize the Orion Spacecraft (whose first test flight took place in December 2014) to land on the asteroid, collect samples, and return them to Earth.