Rover will take extra day to roll

PASADENA, Calif. -- NASA scientists said Sunday they had decided to keep the Spirit rover on its lander for an extra day, putting off its rollout onto the martian landscape until at least late Wednesday.

NASA adjusted the robot's schedule based on analysis of photos and data it sent back, they said, and added that another day-long delay is possible. That's not unusual given the complex nature of the mission, they said.

"We adjust and plan every day to manage risks and resources," Arthur Amador, a mission manager, said at a news conference.