You start on the launch pad at Baikonur, altitude zero. Every correct answer lifts you higher, through the edge of space, into orbit with the stations, up to the Moon and beyond. Answer them all and you reach lunar distance, 384,400 km from Earth.
Wrong answer? You fall back to the last milestone you passed on the way up. Three 50:50 jokers and two skips are in your flight plan, comrade.