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In this video I will start a new series on Understanding Space, Time & Relativity. I will explore what we know, what we think to be true, and concepts that are still very controversial. I will answer: What is space? Is it a vacuum? Is it expanding? What is time? Is it relative? What is relativity?

Next video in this series can be seen at:
https://youtu.be/EltBLp25Gu8