Space Mountain is certainly one of the slower "thrill" coasters in the Disney portfolio, but it is far from the slowest roller coaster in the world. At Walt Disney World's Magic Kingdom, the ride reaches a top speed of only 27 mph, while the Disneyland version is slightly faster at 32 mph. To put this in perspective, Barnstormer (a kiddie coaster) reaches about 25 mph, making Space Mountain only marginally faster. Its reputation for being "intense" comes primarily from its environment; because you are riding in near-total darkness, your vestibular system cannot anticipate the drops and turns, making the 27 mph feel much faster than it actually is. In contrast, blockbuster rides like Guardians of the Galaxy: Cosmic Rewind reach 60 mph, making Space Mountain a relatively gentle experience for thrill-seekers once the lights are turned on.