- Location
- Freiburg
For the sake of pedantry:
The ISS always has a mass of 400 tons, whether it's under Earth gravity, in LEO (note: gravity there is nearly as strong as on the surface, you just don't notice it if you're in free fall), on the Moon, or falling into the sun. Its weight under Earth-surface gravity is about 4e6 N.
Edit: fixed a BBCode typo.
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