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100 years ago our knowlege was very different. For instance, now we send sattelites up into space so Earth's atmosphere does not interfere. We have successfully sent humans into space, and got them back. We have found many more dwarfplanets and stars. Learning science 100 years ago, you probably would have wondered if being in space is possible. Our old dreams are now reality. Mars-2015.

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Q: What are the 3 changes to your understanding of space in the past 100 years?
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