Can You Observe a Typical Universe?

**SPEAKER_1** (0:00)
This episode is brought to you by Accenture. When you're advertising operations fall out of sync, everything else follows. Spotify and Accenture are working together to reinvent the rhythm of ad sales. Using automation, analytics, and smarter workflows to simplify campaign delivery and access better data across the business. The result? Less time spent on operations, more time connecting brands with the moments and fandoms that matter most. Learn more at accenture.com/spotify.

**SPEAKER_2** (0:31)
This episode is brought to you by Google Chrome. You think you know a browser, but Gemini and Chrome, that's new. It can help you with practically anything on the web, like restoring a vintage motorcycle from a 50-page restoration block, or finally break down that long article you've had open for weeks. Gemini and Chrome is here for it. Ready to make anything online make sense? There's no place like Chrome. Check responses set up required compatibility and availability varies 18 plus.

**Matt O'Dowd** (0:56)
The moment you started observing reality, you hopelessly polluted any conclusions you might make about it. The anthropic principle guarantees that you are not seeing the universe in its most typical state. But used correctly, this highly controversial idea can be extremely powerful. So how do you correctly use the anthropic principle?
In 1543, our perspective of the cosmos was radically disrupted. Nicholas Copernicus presented his model for the solar system, which demoted the earth from its position at the center of the universe to just one of several planets orbiting the sun.
As our astronomy improved, we realized that our sun is a typical example out of hundreds of billions of stars in the Milky Way, and that the Milky Way is an ordinary galaxy among hundreds of billions of galaxies in the observable universe.
The notion that we occupy neither a central nor a privileged position in the universe is called the Copernican Principle after the guy who started it. It's extremely important. It allows us to study the distant universe confident that its laws of physics are the same as we experience on Earth. It allows us to understand the origin of the Earth and the Milky Way by studying the ancient light of distant galaxies. The Copernican Principle became such a powerful tool that it took centuries for us to realize that it's wrong. Or at least flawed. It states that we don't occupy a central privileged position, but that's only half true. Earth certainly isn't central, but it is privileged, and not at all a typical environment, nor perhaps is our entire universe.
Our planet and our universe must have at least one non-typical quality they must have been able to produce us. To give rise to living creatures that can observe it. This is the Anthropic Principle, and it seems to contradict the Sacred Copernican Principle. Over the last two episodes, we talked about certain observations of the uniqueness both of our planet and of the universe, and how these feed into two versions of the Anthropic Principle. Today, we're going to bring these ideas together with the Copernican Principle to see just how powerful and how misleading the Anthropic Principle can be. According to the original definitions by Brandon Carter, the weak Anthropic Principle states that we must live in a place and a time in the universe capable of supporting observers– in our case, a habitable biosphere. And the strong Anthropic Principle, which states that the universe itself must have the conditions necessary for producing environments that, in turn…

**SPEAKER_1** (3:56)
This episode is brought to you by Accenture. When your advertising operations fall out of sync, everything else follows.
Spotify and Accenture are working together to reinvent the rhythm of ad sales, using automation, analytics and smarter workflows to simplify campaign delivery and access better data across the business. The result? Less time spent on operations, more time connecting brands with the moments and fandoms that matter most. Learn more at accenture.com/spotify.

**SPEAKER_2** (4:27)
This episode is brought to you by Google Chrome. You think you know a browser, but Gemini and Chrome? That's new. It can help you with practically anything on the web, like restoring a vintage motorcycle from a 50-page restoration block, or finally break down that long article you've had open for weeks. Gemini and Chrome is here for it. Ready to make anything online make sense? There's no place like Chrome. Check responses set up required compatibility and availability varies 18 plus.

**Matt O'Dowd** (4:52)
Produce observers. That means the fundamental constants and initial conditions of the universe must be just right to allow nice habitable planets to form.
Let's just call all of this the anthropic principle. We necessarily observe from an environment capable of producing observers, be that environment a planet within a universe, or a universe within a multiverse.