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The fourth in less than a month – Ansa /Courier TV
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US astronauts Chris Cassidy and Bob Behnken performed their fourth spacewalk in less than a month, this one to upgrade the power system of the International Space Station (ISS). A spacewalk could last up to 7 hours. The two astronauts, who arrived at the International Space Station aboard Space X, will return to earth on August 2.
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