Dear Dr. Universe: What do planets have inside?

Dear Dr. Universe: What do planets have inside? –Rhianna, 10, California Dear Rhianna, Each planet is a little different on the inside. And what’s inside a planet can shape what’s on the outside, too. That’s what I found out from my friend Steve Reidel, a geologist at Washington State University. “Well, there’s the rocky planets,” he… Read More