Astronomer Amy Mainzer makes a homemade comet.
Play games and watch full episodes of Ready Jet Go! on PBS KIDS http://pbskids.org/readyjetgo
READY JET GO! is a PBS KIDS earth science and astronomy series for children ages 3-8. The series follows two neighborhood kids: Sean, who has an all-consuming drive for science facts, and Sydney, who has a passion for science fiction and imagination. They both befriend the new kid on their street, Jet Propulsion, whose family members happen to be aliens from the planet Bortron 7.