The discovery of flowing water on Mars has given NASA fresh urgency to send astronauts to the red planet.
NASA is aiming to send astronauts to Mars between 2030 and 2040.
But how much will it cost?
Current estimates put the cost at US$100 billion (NZ$158 billion).
To put that figure in perspective NASA's annual budget is about US$18 billion (NZ$28 billion).
The budget for the Mars mission would be much less than the US$400 billion (NZ$623 billion) spent already on the F-35 stealth fighter.
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