Russian space officials say cosmonauts on the International Space Station (ISS) have discovered new cracks in one of its modules, presenting another challenge for the aging space station. "Shallow cracks have been discovered in some places of the Zarya module," Vladimir Soloviev, chief engineer at rocket and space company Energia, told the Russia-based RIA news agency. "It's bad and suggests that the cracks will start to expand over time." Soloviev did not say whether the cracks caused air to leak from the ISS. News of the cracks comes after last month's incident on the ISS, where a Russian module docked at the station accidentally ignited its thrusters, briefly throwing the station off course. Although the engineers who returned to mission control were able to correct the situation, there are concerns that unexpected stress on the structure may have damaged it in a way and at a location that engineers have not yet identified. There have also been other recent problems, such as last month's report of an air pressure drop on the ISS module Zvezda that was found to be caused by an air leak.