Mark Kelly retired as an astronaut just last fall—but he's already back to work. Gabrielle Giffords' husband is writing a children's book about a mouse who travels to space, the AP reports. It's called Mousetronaut: A Partially True Story, and it's inspired by some of Kelly's own furry friends. "On my first space shuttle flight, we had 18 mice on board as experiments," he says.
"And 17 of them, as soon as we got into zero gravity, stayed latched on to the side of the cage. But one of them seemed comfortable through the whole mission, like he was enjoying it." Simon and Schuster has released a brief description of the story, which centers on a mouse joining a mission to space. "While in space, the astronauts are busy with their mission when only the smallest member of the crew can save the day," the publishers say. Kelly also collaborated on his wife's memoir. (Read more Mark Kelly stories.)