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CAPE CANAVERAL, Fla. — Two spacewalking astronauts, armed with a caulk gun and high-tech kind of Silly Putty, floated out the hatch Thursday to test a method for patching shuttle thermal tiles.
It was the fourth spacewalk since Endeavour arrived at the international space station just over a week ago to deliver a robot and the first section of a Japanese lab.
Astronauts Michael Foreman and Robert Behnken were testing a caulk-gun-like dispenser and putty, filling holes in deliberately damaged tile samples that were carried up aboard Endeavour. The samples will be returned to Earth for analysis.
One more spacewalk is planned for Endeavour’s 12-day space station visit.
