Starts With A Bang #128 - Planet formation and proto-protoplanets

Whenever a new star forms, several processes appear to be nearly universal. A cloud of cold molecular gas contracts, fragments, and rapidly collapses in certain places. The densest, coldest clumps of gas contract first, drawing in larger and larger amounts of matter onto them. A large, massive enough clump will heat up and have a random shape: collapsing along the shortest axis first, forming a protostar at the center surrounded by a disk of material. That's where the story of planet formation begins. Assuming the conditions in the disk are sufficient, clumps will begin to form, and over hundreds of thousands to millions of years, the first protoplanets and then full-fledged planets will arise: a relatively rapid cosmic process, that's usually all complete within a mere 10 million years: a blink of a cosmic eye in the history of our own 4.5 billion year old Solar System. However, by looking at the youngest stellar and planetary systems, we can uncover many details that are common to planetary systems in general, and in turn, we can learn how our own Solar System grew up. This fantastic episode of the Starts With A Bang podcast features observational astrochemist Dr. Charles Law, and takes us inside one of the most remarkable young stellar systems ever found: the edge-on system known as Gomez's Hamburger, complete with a first-of-its-kind exoplanet known as GoHam b. Come find out the incredible science behind planet formation, and meet our first-ever proto-protoplanet in the process! (This JWST NIRCam image shows many never-before-revealed details in the dusty disk of the edge-on protoplanetary system known as Gomez's Hamburger, with a massive, unique exoplanet within the disk known as GoHam b. Credit : NASA/ESA/CSA JWST; Francois Menard et al.)

You can listen to Starts With A Bang #128 - Planet formation and proto-protoplanets online on Radio and Podcast. Open the player on this page to stream the available audio.

Starts With A Bang #128 - Planet formation and proto-protoplanets is an episode from Starts With A Bang podcast by Ethan Siegel.

This episode is 01:40:05 long.

This episode was published on Apr 11, 2026.

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