NASA’s ambitious plan to return to the moon may cost as much as $30 billion over the next five years, the agency’s administrator, Jim Bridenstine, indicated in an interview this week. This is only a ballpark figure, but it’s the first all-inclusive one we’ve seen and, despite being a large amount of money, is lower than some might have guessed.

Bridenstine floated the figure in an interview with CNN, suggesting that the agency would need somewhere between $20 billion and $30 billion for the purpose of returning to the surface of the Moon. Anything beyond that, such as fleshing out the Lunar Gateway or establishing a persistent presence, would incur additional costs.

To put this figure in perspective, NASA’s annual budget is about $20 billion, very little compared to many other agencies and budget items in the federal government.

The speculated additional costs would average $4-6 billion per year, though spending may not be so consistent. NASA only asked for an additional $1.6 billion for the upcoming year, for instance.

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