Staircases in Space: Why Are Places in Science Fiction Not Wheelchair-Accessible?

Space, as we all know, is the final frontier. It's the star-spangled playground in which our imaginations run amok, and the setting for stories that made us fall in love with sci-fi. Some of us spent hours pretending we were the Doctor's companions, helping him find Gallifrey from the TARDIS. Some of us imagined the ...