7. In order for space tourists to walk around and function normally, it is necessary for the space city to create a ________.
8. What making going to space the most expensive vacation is the enormous cost involved in ________.
9. Each year 500,000 space tourists could be flying into space if ticket prices could be lowered to ________.
10. Within the next two decades, ________ could be as intercity air travel.
Unit 2
1. N 2. Y 3. Y 4. NG
5.a trip to the Mir Space Station
6.a space hotel
7.small gravitational
8. the fuel of spacecraft
9.$50,000
10. space travel
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