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The Conversation USA

What moons in other solar systems reveal about planets like Neptune and Jupiter

  • Written by Bradley Hansen, Professor of Physics and Astronomy, University of California, Los Angeles
Exomoons orbiting an exoplanet outside our solar system.Dotted Yeti/Shutterstock.com

What is the difference between a planet-satellite system as we have with the Earth and Moon, versus a binary planet – two planets orbiting each other in a cosmic do-si-do?

I am an astronomer interested in planets orbiting nearby stars, and gas giants –...

Read more: What moons in other solar systems reveal about planets like Neptune and Jupiter

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