The International Space Station is often called the most expensive object ever built. Roughly how much has it cost all partner nations combined, in US dollars?

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Answer

About 150 billion USD

Fifteen countries share the bill, and the station was assembled in orbit from pieces delivered over more than 40 flights.

How to estimate it

Add three parts. Assembly took about 35 Space Shuttle flights at roughly 1.5 billion dollars each: 52 billion. Building the modules, trusses and solar arrays cost perhaps 40 billion. Running the station costs about 3 billion a year, and it has operated for 25 years: 75 billion. 52 + 40 + 75 = 167 billion. The usual estimate is about 150 billion US dollars.

Source: NASA Office of Inspector General; ESA

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