Episode 120: Old Galaxies, New Problems

What this episode covers

We’ve known about the existence of galaxies for about a hundred years, but how well do we actually know the extragalactic universe? In today’s episode, we dive deep on the earliest galaxies in the universe. Sanika covers her first bite on paradoxical galaxies that seem to be the deadest where we expect them to be alivest, and Shashank shows us a source of hidden mass in ancient galaxies that for once isn’t dark matter. Astrobites: The Walking Red: Why are you so quiet and overdense? https://astrobites.org/2026/04/03/walking-red/ Too Massive, Too Early… and Still Not Massive Enough? https://astrobites.org/2026/04/07/too-massive-too-early/ Space Sound: https://www.youtube.com/watch?v=4BPFHTVMmbQ

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How long is this episode of astro[sound]bites?

This episode is 45 minutes long.

When was this astro[sound]bites episode published?

This episode was published on May 11, 2026.

What is this episode about?

We’ve known about the existence of galaxies for about a hundred years, but how well do we actually know the extragalactic universe? In today’s episode, we dive deep on the earliest galaxies in the universe. Sanika covers her first bite on...

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