Discover the makeup of four active Solar System moons, worlds unto themselves with unique, dynamic environments. The ice worlds of Europa and Enceladus can be compared and contrasted with methane-rich Titan and fiery Io. How similar or different is each moon from our own active world, Earth?
IMAGE: NASA, Joseph Olmsted (STScI)
<a rel="nofollow" class="external text" href="https://webbtelescope.org/contents/media/images/2019/34/4543-Image">Moons: Active Worlds</a>