Task 4. fill in the gaps with the words. scientific research, space probes, built, delivered, solar systems, require, equipment, space journeys, space station, shuttle nowadays travelling even to earth’s closest neighbour planet mars, let alone the planets in other is still impractical. a trip to mars and back would take more than a year. the supplies and fuel for such a trip would a vast rocket to launch a spacecraft from earth. a return trip to the outer planets would take a lifetime. for the time being, remain the best way of exploring distant worlds. work is under way on a new international which will be a base for a it is a modular structure, being built in space module-by-module, with sections being into orbit by the and unmanned launch vehicles. in the future, space stations such as this, or permanent bases on the moon, could be a starting point for spacecraft would be and launched from there rather than from earth.