Barack Obama says it should be possible to send astronauts to orbit the planet Mars by the mid-2030s and return them safely to Earth.
The US president made the claim in a major speech to staff at the Kennedy Space Center in Florida.
He was laying out the details of his new policy for the US space agency.
Mr Obama said he was giving NASA challenging goals and the funding needed to achieve them, including an extra $6bn over the next five years.
“By 2025, we expect new spacecraft designed for long journeys to allow us to begin the first ever crew missions beyond the Moon into deep space,” the President said. “So, we’ll start by sending astronauts to an asteroid for the first time in history.”
And then he added: “By the mid-2030s, I believe we can send humans to orbit Mars and return them safely to Earth, and a landing on Mars will follow.”