View from the International Space Station during the Summer of 2013.
WASHINGTON — NASA says there's mechanical trouble on the International Space Station, but there is no current threat to any of the astronauts on board.
Agency spokesman Kelly Humphries says the problem may eventually be serious, but is not an emergency at the moment.
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Humphries says the faulty external pump stopped working but is now up and running. It is part of one of the two cooling systems aboard the orbital outpost. He says as a precaution, the three Russians, two Americans and one Japanese crew members aboard shut down some minor operating systems to reduce the power load.
Engineers are trying to figure out if this is hardware or software problem.
MORE: Photos of Earth from the I.S.S.
New York City, posted on April 23, 2013. Cmdr. Chris Hadfield tweets: Incredibly clear, before the trees have filled with leaves. (Chris Hadfield/NASA)