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.

Leaks are affecting a key part of the International Space Station. NASA and Russia’s space agency, Roscosmos, are not seeing eye to eye about the level of risk.

Officials with NASA are at odds with their counterparts at the Russian space agency Roscosmos over the severity of a leak aboard the International Space Station.