I learned so much when he came, like how every day people discover new planets! Some of my favorite things I learned about where, How big and how small telescopes can be! Also I learned about stars and planets and how far other planets are from us! We also got to see a cool slide show about orbits and other cool things he taught us about. It looked hard to be an astronomer, but fun at the same time. Also he told us how some days you can't look into the sky and see the stars because it's too cloudy! It was really fun!