If you would like to see more articles like this please support our coverage of the space program by becoming a Spaceflight Now Member. If everyone who enjoys our website helps fund it, we can expand and improve our coverage further. EDITOR’S NOTE: Updated at 2 p.m. EST (1900 GMT) after end of spacewalk. STORY WRITTEN FOR CBS NEWS & USED WITH PERMISSION Two astronauts floated outside the International Space Station Sunday for the first in a series of spacewalks to upgrade the lab’s aging solar power system, assembling a support fixture that eventually will hold a new solar blanket.