How Far Beyond Earth Could Humanity Spread?

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We humans have always been explorers. The great civilizations that have arisen across the world are owed to our restless ancestors. These days, there’s not much of Earth left to explore. But if we look up, there’s a whole universe out there waiting for us. Future generations may one day explore the cosmos and even settle entire other galaxies. But there is a hard limit to how much of the universe we can expand into. So, how big can humanity get?

Episodes Referenced:
How Much Of The Universe Can Humanity Ever See?:    • How Much Of The Universe Can Humanity Ever...  
Is Interstellar Travel Possible?:    • Is Interstellar Travel Impossible?  
What If Humanity Is Among The First Spacefaring Civilizations?:    • What If Humanity Is Among The First Spacef...  

The Edges of Our Universe by Toby Ord: https://arxiv.org/pdf/2104.01191.pdf
A causal limit to communication within an expanding cosmological civilization by S. Jay Olson: https://arxiv.org/pdf/2208.07871.pdf

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