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Below are two videos from the BrainPop Website that will help you understand the early ideas of orbital motion and space exploration.

Galileo Galilei
This video goes through the life of Galileo Galilei who is considered one of the first explorers of space. While he did all of his research from Earth's surface, many of his observations and discoveries paved the way for future space exploration.

Could they really exist? This short video answer the question that many students have... is there other life out there?
Watch as Tim and Moby describe the possibility and probability of life on other planets.