The international space station's newest power source, a set of solar wings, made its debut yesterday.

The solar array is part of a new 17.5-ton space station segment that was connected to the orbiting outpost during a spacewalk Monday.

The solar wings were deployed one at a time, first halfway unfurled and allowed to warm in the sun about 30 minutes. That prevented the solar panels from sticking together.

"We see a good deploy," astronaut James Reilly, who helped connect the new segment on Monday, said after the second wing was unfurled.

The new solar panels were unfolded like an accordion window blind, their orange and black colors reflecting the sunlight.

Each solar wing is 115 feet long and weighs more than 2,400 pounds. The entire solar array's wingspan is more than 240 feet. The array, which converts sunlight to electricity, is the station's third pair of solar panels.

Overnight last night, while the astronauts on the shuttle Atlantis slept, engineers at mission control were to begin remotely unfolding the array from its storage box.

The National Aeronautics and Space Administration was expected to decide yesterday when Atlantis astronauts would fix a peeled-back thermal blanket near the spacecraft's tail. They are leaning toward using a sewing kit normally reserved for fixing spacesuits .

The shuttle astronauts' 11-day mission was extended Monday by two days to allow time to fix the thermal blanket, which peeled during launch last week.

Engineers at Johnson Space Center in Houston were practicing techniques the astronauts might use to make repairs.

The repair to the thermal blanket, covering a 4-by-6-inch area over an engine pod, would probably involve an astronaut reaching the shuttle's tail area while being attached to the end of the spacecraft's robotic arm and boom.

The thermal blankets are used to protect the shuttle from searing heat during re entry . Engineers don't think the intense heat could burn through the graphite structure underneath it and jeopardize the spacecraft.

But it could damage the shuttle, requiring repairs after landing that could delay three additional flights to the space station NASA has scheduled for this year.