The two Russian cosmonauts were in the process of isolating a leaking radiator when a bubble of coolant leaked out of it.
A bubble of coolant leaked out of a radiator attached to the International Space Station , jeopardizing an ongoing spacewalk by two Russian cosmonauts on Wednesday. Cosmonauts Oleg Kononenko and Nikolai Chub exited the ISS and began their spacewalk at 1:49 p.m. ET. During the nearly eight hour spacewalk, the pair were inspecting a leak on a backup radiator on Russia’s Nauka laboratory module when residual coolant spewed out of the leak site, NASA wrote in a blog post.
Although the main radiator was still working normally and did not disrupt ISS operations, the leak resulted in the delay of two NASA spacewalks as engineers reviewed the data of the incident. During Wednesday’s spacewalk, the cosmonauts installed a synthetic radar communications system and released a nanosatellite to test solar sail technology.
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Cosmonauts on ISS spacewalk encounter toxic coolant 'blob' while inspecting leaky radiatorRobert Pearlman is a space historian, journalist and the founder and editor of collectSPACE.com, an online publication and community devoted to space history with a particular focus on how and where space exploration intersects with pop culture. Pearlman is also a contributing writer for Space.
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