Some of the main modules of the International Space Station are nearly a quarter-century old. "That's considered classic for a car," said Bennett Maruca, an astronomer and physicist at the University of Delaware.So it's little surprise one of the earliest chambers, attached in 2000, has sprung a problematic leak. The leak is in Russia's Zvezda service module, an area connecting the module to a docking port, and it was first detected five years ago.