Two teams touch down at the STARS space station to take on three scientific challenges to win out-of-this-world prizes. First, the teams must guess which animals Sam and Ayo are looking at through their telescope based on a series of clues. Then the teams must work out which season James is talking about by standing under the correct tree. If they’re correct, they’ll get covered in spring blossom, summer sunlight, autumn leaves or winter snow. Finally, the teams learn about structures by building arched bridges that they can step across to reach an island. Meanwhile, Ayo and Sam are packing for a mission in the space capsule, but they can’t carry more than 2.5kg. Can they work out what to take so that their packs aren’t too heavy?