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Did you guess space travel? If so, Professor Patrick Collins, a professor of economics in Japan, agrees with you. At a recent lecture he said, "It won't be long before people [call|are calling|will call|will be calling] their travel agents and [will book|book|will be booking|are booking] their flights to the Moon. Imagine! Yes, there is room on tomorrow's flight to the Moon. It [will be leaving|is going to leave|leaves|will have left] at 9 a.m. It [will be|is going to be|is being|is] full so please arrive early for check-in. Of course, many people disagree with Collins. They think space travel [is costing|is going to cost|will cost|costs] too much and not many people [will travel|travel|are travelling|will have travelled]. They also think that people [don't feel| aren't feeling|aren't going to feel|won't feel] safe enough to travel into space. But Collins's research shows that the majority of people think it [will be|is going to be|is being|is] worth saving their money to travel into space. He claims that while it [starts out|is starting out|will start out|will be starting out] as an activity for a few rich individuals, it [will grow|grows|is growing|will have grown] very quickly – just like the aviation industry grew in the last 100 years.