• Question: What is the smalles planet you know of (not just in our solar system)?

    Asked by TJ to Lisa, Mark, Rachel, Sammie, Stephen, Tim on 12 Mar 2018.
    • Photo: Mark Mirmelstein

      Mark Mirmelstein answered on 12 Mar 2018:

      With current methods, we cannot discover really really small planets, so at the moment the smallest planet we know about is Mercury in our solar system.