Ask Ethan #45: How deep does the Multiverse go?

Which ideas are likely, which ones are speculative, and which ones are pure fiction?

Ethan Siegel
Jul 12, 2014 · 9 min read
https://www.youtube.com/watch?v=08LBltePDZw
Image for post
Image for post
Image credit: NASA; ESA; G. Illingworth, D. Magee, and P. Oesch, University of California, Santa Cruz; R. Bouwens, Leiden University; and the HUDF09 Team.
Image for post
Image for post
Image credit: Wikimedia Commons users Frédéric MICHEL and Azcolvin429, annotated by me.
Image for post
Image for post
Image credit: ESA and the Planck Collaboration.
Image for post
Image for post
Image credit: wiseGEEK, © 2003 — 2014 Conjecture Corporation, via http://www.wisegeek.com/what-is-cosmology.htm#; original from Shutterstock / DesignUA.
Image for post
Image for post
Image credit: Cosmic Inflation by Don Dixon.
Image for post
Image for post
Image credit: me (L); Ned Wright’s cosmology tutorial (R).
Image for post
Image for post
Image credit: me.
Image for post
Image for post
Image credit: BellaCielo of deviantART, via http://bellacielo.deviantart.com/art/Multiverse-143191929.
Image for post
Image for post
Image credit: me, created using Google’s graph tool.
Image for post
Image for post
Image credit: Max Tegmark / Scientific American, by Alfred T. Kamajian.
Image for post
Image for post
Image credit: Wikimedia commons user Christian Schirm.
Image for post
Image for post
Image credit: World Science Festival, via http://www.worldsciencefestival.com/participants/simon_singh/.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Ethan Siegel

Written by

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Ethan Siegel

Written by

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

Starts With A Bang!

The Universe is out there, waiting for you to discover it.

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch

Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore

Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store