Spacewalk Today to Focus on Battery Replacement

Two of space shuttle Endeavour's astronauts, David Wolf and Chris Cassidy, will venture outside of the international space station today, to replace a few old batteries which help control movement of a solar array.

The pair are to begin their stroll in space this morning at 11AM EDT, will spend the entire time outside replacing four of the six batteries on the Port 6 solar array power channel. This will be Wolf's seventh spacewalk, and rookie Cassidy's, a former Navy SEAL's first.

Today's the third spacewalk of the the STS-127 mission is expected to wrap up at about 5:30 pm. On Friday, the fourth of the five spacewalks is planned.