Space Trip is the bonus racecourse that can only be unlocked when you complete the World Grand Prix in 1st Place in Choro-Q HG 3.
It is set on a space station and a hollowed asteroid, with many edge-less roads, making it possible for you and the AI to fall off. The race is roughly 2 minutes per lap and has 3 laps.
If you fall off the race, you will retire and win nothing. If the AI falls off, the AI will be deleted from the race, and the total place count will go down.