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With the ISS slated for retirement in 2028, NASA is now making bold plans for the next phase of human spaceflight. The plans call for astronauts to return to the moon and then venture deeper into space. As President Trump said in December, these will be the first steps toward “an eventual mission to Mars and perhaps someday to many worlds beyond.”

A new space station is key to NASA’s plans. Unlike the ISS, the proposed Deep Space Gateway (DSG) will orbit the moon rather than Earth. Its crew will live and work a whopping quarter of a million miles from home — a thousand times more distant than the ISS.