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HINT:Jupiter and Saturn

???????? Uranus, Neptune and Pluto

???????? Mars

?????????Martians

??????? Mercury

Both planets are worth seeing, actually. Let's count in both Jupiter and Saturn on our itinerary. But I will definitely spare Uranus, Neptune and Pluto in my schedule. They are too far away from the earth. Besides, too little is known about them. We'd certainly go to Mars, wouldn't we? It's closer to the earth and better known. I'd go there and explore its canals; and if I were lucky enough, I might meet a couple of Martians. The Martians? I wonder if there are living creatures there. Where else in space could we go? Mercury. Don't forget Mercury. I would be able to break the world's records in the high jump on Mercury and make a name in history. You know, the gravity there is only about a third as strong as it is on the earth. Really. It's very ambitious of us to come up with the idea of touring around the solar system, I wonder if it will happen in 300 years.