Astronauts work on space lab during busy mission

By Ed Stoddard

HOUSTON (Reuters) - Astronauts worked to outfit Europe's new permanent space laboratory on Saturday as a busy visit by NASA's shuttle Atlantis to the International Space Station neared its end.

NASA readied landing sites at both the Kennedy Space Center in Florida and Edwards Air Force Base in California to ensure a Wednesday landing, as the U.S. military is waiting for the shuttle to land before it tries to shoot down a disabled spy satellite with a missile.

During a news conference with reporters in Europe and the United States, Atlantis commander Steve Frick said he had no worries about the satellite shootdown.

"We don't have any concerns ... we're going to be safely on the ground before they take any action," Frick said.

The Pentagon on Thursday said the Navy would try to destroy the satellite before it enters the atmosphere, using a modified tactical missile from a ship in the Pacific, to avert a potentially deadly leak of toxic gas from its fuel tank.

The Columbus module, the European Space Agency's $1.9 billion space lab, was launched aboard Atlantis last week and connected to the space station on Monday.

The astronauts on Saturday set up a physiology module inside Columbus to investigate effects of long-duration spaceflight on the human body, an area of interest with NASA's long-range goal of a manned Mars mission.

They also worked on activating a biolab that will be used for a range of experiments on cells, tissue cultures and other organisms.