The longest lunar eclipse in a century arrives tonight, and Mars is also at its brightest. Astronaut Captain Mark Kelly will join Anderson Cooper on Full Circle to talk all about it. What questions do you have for him?

And what questions do you have for Anderson about covering children? They are often the most challenging stories but also sometimes the most rewarding subjects.

Join us today at 6:25p ET and click ‘Get Reminder’ to be notified when the show's about to start.