D&D: Spelljammer - Adventures in Space contains everything you need to run campaigns and other adventures in the starlit realms of Wildspace and the Astral Sea, as well as create characters that hail from these interstellar places.
The Astral Adventurer’s Guide, a 64-page hardcover book for players and Dungeon Masters that presents the Astral Plane as a campaign setting and includes space-based character options, spells and magic items, deck plans and descriptions for spelljamming ships, and more
Boo’s Astral Menagerie, a 64-page hardcover book for Dungeon Masters that presents game statistics and descriptions for over 60 creatures found in Wildspace and the Astral Sea, including astral elves, cosmic horrors, lunar and solar dragons, murder comets, and space clowns.
Light of Xaryxis, a 64-page hardcover adventure for Dungeon Masters that is set in the Astral Plane and designed for characters of levels 5–8
Double-sided poster map of the Rock of Bral, an asteroid-city that can serve as both an adventure location and a campaign hub in the Astral Plane