Is Mars a Solid or a Liquid Core?

Yeat: Is it possible for a planet of our size to have a solid core? Yeat: The reason that we do have a liquid core is because of all that temperature and pressure. It's going to take more than a hundred billion years before the earth cools so we got some time. Other planets are different sizes, and so they will have different cooling off times. He but before we answer this question, we wanted to answer a question from one of our listeners, perhaps our youngest listener. You may remember last week we talked about hannah, who was homesick from school. And she said, monkey.