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CAPTION ONLY: GALAXY’S BEST WEIGHT-LOSS PROGRAM

SHARE CAPTION ONLY: GALAXY’S BEST WEIGHT-LOSS PROGRAM

French astronaut Jean-Jacques Favier works above astronaut Susan Helms in a televised view from Co-lumbia's space lab Tuesday. The astronauts are studying the effects of weightlessness on the body during the 16-day medical-research mission. Flight directors expect to decide later this week whether to extend the trip to 17 days, making it the longest shuttle trip ever. Astronauts are already one-third of the way through the mission. Medical experts monitor the astronauts' sleep, moods and work performance.