This story was updated at 12:03 p.m. ET NASA engineers are still perplexed by a stuck valve in the International Space Station's cooling system and may even add an extra spacewalk to fix it to the ...

Part 1 in this series covered defrost cycle problems in heat pumps. Now, let's discuss the second major winter issue: heat pumps stuck in one mode. The customer calls and says the system won't switch ...

A pair of spacewalking astronauts finished installing a fresh storage tank outside the International Space Station on Tuesday, but a stuck valve was threatening to jeopardize half of the cooling ...

Boeing has identified a “most probable cause” for why its spacecraft valves were stuck closed in August. These valves, which prevented the company from launching its CST-100 Starliner capsule to the ...