When and where are they going? Would you like to travel into outer space or even go the moon? Many people dream of space travel, but you can't just fly there in a jet plane. Jet engines work by using oxygen from the air to burn their fuel. And of course there is little or no oxygen in space depending on where you're headed. Fuel cannot burn without oxygen. The only kind of engine that …
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showed last 75 words of 3929 total
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