Making Mars habitable will require us to master the conversion of raw Martian materials into resources we can use to survive. Fortunately, Mars has a wealth of usable materials, making it one of the most human-habitable places in the solar system, other than Earth itself.
In March, NASA officials revealed updated plans for a small space station near the Moon called the Deep Space Gateway. Anatoly Zak reports the plans threw a monkey wrench into years-long planning efforts by NASA’s international partners.
The Space Launch System and Orion won't fly until 2019, and NASA is sticking with its original plan not to include astronauts for the maiden mission. Here is a timeline of some of the programs' major twists and turns over the years.