Travelling at about 7.8 km/s (4.9 miles/s), the ISS completes an orbit around Earth every 92 minutes.It is estimated that $150 billion USD was spent constructing it with a further $4 billion a year to operate. The station has been described as the most expensive thing humans have ever constructed.The station has a pressurized volume, where the astronauts live, which is about the same as a 747 Jumbo jet! This is almost four times bigger than the Mir Space Station, and five times bigger than NASA’s Skylab.This makes it the largest man-made structure ever built in space! The completed ISS has a mass of over 420,000 kilograms (926,000 pounds) and is over 108.5 m (356 feet) wide – the same size as an entire American football field.It took more than 115 space flights by spacecraft like the Space Shuttle and Proton rocket to construction the ISS.Two weeks later NASA launched their ‘Unity’ module. ![]() It was launched aboard a Proton rocket in 1998.
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