Universe is full of aliens | Robin Hanson and Lex Fridman

TL;DR

The Grabby Aliens Model suggests that the universe is filling up with expanding alien civilizations, but we don't see them because they are moving very fast.

Transcript

but let us return for a time to aliens so you started to define sort of the the model the parameters of uh grabbiness right or the uh as we approach crabbiness so what happens so again there's three parameters yes there's the speed at which they expand there's the rate at which they appear in time and that rate has a constant and a power so we've t... Read More

Key Insights

• 👻 The Grabby Aliens Model allows us to tell a story of cosmology with actors and agendas.
• ⛔ Our current understanding of cosmology is limited because most models assume we are the only active civilization in the universe.
• 👽 The model suggests that the universe is filling up with alien civilizations, and in a few billion years, it'll be completely full.
• 👽 We can figure out the existence of alien civilizations by cleverly analyzing the few things we can observe, including our current date.

Questions & Answers

Q: Why don't we see any grabby alien civilizations in the sky?

The model suggests that if the civilizations were expanding slowly, we would see them. The fact that we don't indicates they are expanding quickly, close to the speed of light.

Q: How do we explain our early existence compared to the predicted timeline?

According to the model, if the universe were to stay empty and wait for advanced life to appear, it should happen trillions of years in the future. Our early existence suggests that this assumption is unlikely.

Q: What are the potential ways in which we could detect quickly expanding alien civilizations?

We might see spheres in the sky growing rapidly. However, the likelihood of detecting them depends on their speed of expansion and our proximity to them.

Q: Can we exclude the possibility that grabby aliens are already here?

While it's difficult to say definitively, if they could travel faster than the speed of light, they would have already filled up the entire universe. So, it is less likely that they are already here.

Summary & Key Takeaways

• There are three parameters in the Grabby Aliens Model: the speed at which they expand, the rate at which they appear in time, and the power of that rate.

• If the alien civilizations were expanding slowly, our sky would be filled with visible spheres of activity. However, since we don't see them, it suggests they are expanding quickly.

• According to the model, we are at a pivotal moment in history where other alien civilizations may have already reached and passed this stage of expansion.