How big can a rocky planet get? Can a rocky planet turn into a gas giant? Why are some planets rocky and others gassy? I discuss these questions and more in today's Ask a Spaceman!

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Thanks to Cathy Rinella for editing.

SFX CC-0 credit, davidou

Hosted by Paul M. Sutter, astrophysicist and the one and only Agent to the Stars (http://www.pmsutter.com).