What you need to know about the laws of space

Neil deGrasse Tyson has said he loses "sleep at night wondering whether we are intelligent enough to figure out the universe." It's a valid concern. We've put a man on the moon, landed on a comet and roved around on Mars, but it's really only the tip of the iceberg. There's so much that we haven't seen and don't know, it seems almost impossible to fully understand the universe.

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