Since Sunday, one of the two channels on Natalie Meilinger's baby monitor has been picking up black-and-white video from inside the space shuttle Atlantis. The other still lets her keep an eye on her baby.

"Whoever has a baby monitor knows what you'll usually see," Meilinger said. "No one would ever expect this."

Live video of the mission is available on NASA's Web site, so it's possible the monitor is picking up a signal from somewhere.

"It's not coming straight from the shuttle," NASA spokeswoman Brandi Dean said. "People here think this is very interesting and you don't hear of it often -- if at all."