Which Disney theme park was the first to have the attraction Space Mountain?

Which Disney theme park was the first to have the attraction Space Mountain? Magic Kingdom was the first.

Space Mountain opened at Magic Kingdom in Walt Disney World, Florida, on January 15, 1975. It was the first Space Mountain attraction anywhere and became the original version of a ride later adapted for other Disney parks. Its indoor setting created a dark, star-filled environment that made the ride feel like a journey through outer space.

The attraction grew from Walt Disney's interest in adding a thrilling, space-themed experience to Tomorrowland. Imagineers were inspired in part by Disneyland's Matterhorn Bobsleds, but Space Mountain used a fully enclosed, computer-designed dual-track coaster concept. The project was delayed while Disneyland expanded and Walt Disney World was developed, which helps explain why the Florida park received it first.

Disneyland's version opened in 1977, two years after Magic Kingdom's. Epcot never received the original Space Mountain attraction, and Disney California Adventure is not the home of the first version. The Magic Kingdom ride remains a landmark in Disney attraction design.