Astronauts from the Endeavour space shuttle are almost done replacing International Space Station batteries that store power collected by the ISS’ solar wings. As spacewalkers Chris Cassidy and Tom Marshburn toil on the 7.5-hour spacewalk, Russia launches a cargo ship to ISS.
– Construction on the International Space Station continued July 24 as the
Space Shuttle Endeavour crew engaged in a marathon 7.5-hour spacewalk to swap
out batteries for the ISS’ oldest set of solar arrays. The batteries store
power collected by the solar wings and cost $3.6 million each.

The 1…