But cheap. Just the thing for anyone interested in life off our home planet. You pick from our 5” x 3-1/2” (passport size) 50-page notebooks. The Moon Passport has blank, ruled pages with a small moon phase in the corners plus a bonus fold-out lunar map and chart; and the Mars Passport has blank pages with 3/16” square grids and some fun Martian facts on the inside back cover. And no, sadly, they are not yet approved for actual space travel.