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?

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Комментарии

It's funny how you weren't planning on ever visiting that galaxy 100 billion light years away, but when science says you can't it's suddenly all you've ever wanted. So weird how these limits are still unfathomably huge, but still feel depressingly small when you realize they might be absolute limits of travel for the entirety of forever.

freelancer

For some reason, the phrase “…humanity, or whatever succeeds us…” really caught my attention.

elvisneedsboats

I love the thought experiment of the Slow Starship, that puts humans in stasis to travel to a distant star system only to awaken and find that future humans have already arrived by a faster starship and evolved both biologically and technologically!

one_hoop

I always thought of space and time being on such unfathomably massive time scales that we could never perceive a change without multigenerational record-keeping. Hearing that every *year* we lose 3 galaxies is so mindboggling.

dentistrider

One of the biggest things I drew from this episode, that I've never really put much thought into, is that the speed in which we expand from Earth ultimately reduces the amount of communication we can have with it (same for any origin point).

dylancurbjumper

A followup question I'd like to see explored: assuming we send Von Neumann probes in every direction as fast as possible and as soon as possible, programmed to retrofit every single star in the affectable universe with a stellar engine, and pilot them all toward each other at maximum speed, how much of the affectable universe could we bring together into a gravitationally bound cluster, so as not to be so isolated by the Era of Isolation?

Pfhorrest

hey matt, long time watcher and fan. The world is getting scarier as time marches on, but watching space time has consistently been there and given me something I can think about. Thank you for the work you and the rest of space time do. ❤

eau_defemme

I am a simple man and i dont understand many of the things touched on in these videos, but i still enjoy them

alexvalin

PBS Space Time is the perfect combination of huge knowledge and flawless animations, both in an ideal setup to enjoy the content and also learn from it. I've been following it for years and I'm still impressed. I really hope there's content for more years to come, I can't imagine my Youtube feed without the joy of having a new video.

keisimo

I feel like this channel is so good at slowly accumulating enough reference knowledge from past videos to bring up new and harder to explain topics. Very good programming.

panner

I can’t shake the massive universe size of FOMO, thinking about the exploration and experiences we are missing out on by being born before we could explore any exoplanet…. It’s devastating.

opiesmith

I'm British and was at the Natural History Museum in NYC last month when I saw a very familiar, albeit beardless, Aussie physicist participating in one of the video exhibits in the space wing of the museum. Never knew you were quite so prolific, Matt!

kierranhorsfield

I'm still holding out hope for wormhole travel.

RHCole

Thank you for posting this video at the exact moment that I was available and able to watch it. These videos always make me so happy... even if they are existentially disturbing.

jargontrueseer