Exoplanets: Weird, Wondrous Worlds

There's a huge amount of variety among exoplanets – planets outside our solar system. There are water worlds, lava planets, egg-shaped worlds, planets with multiple suns, and even planets with no sun at all! What can we learn from all this weird, wondrous variety? What does it tell us about both the exoplanets themselves and our own home planet? Credit: NASA/JPL-Caltech