(AP) -- Astronauts are conserving power on the space shuttle Atlantis because bad weather in Florida may keep them in orbit longer than planned.
Storms could delay a scheduled Friday landing at Kennedy Space Center. NASA can try again in Florida on Saturday and if that doesn't work, they have several options for a Sunday landing.
Astronauts have the day off Wednesday. They told reporters during a news conference that they were looking forward to coming home after the 11-day mission.
They said their upgrades of the 19-year-old Hubble Space Telescope showed how important it is to have humans and machines work together in space.
Later Wednesday, President Barack Obama will make a private phone call to Atlantis.
©2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
Explore further: Cassini: Return to Rhea