Astra Cabastini is the Science Nerds' astronomy expert. She is 9 years old. She is like an astronaut who explores the universe. She loves stars, planets, and all things cosmic. Her older sibling is Juli, aged 12, another Science Nerd. Astra also likes the other Science Nerds Tim, Juli, Electro, Max, and Chloe and Gizmo the robot. Astra also likes studying psychology. She has a boyfriend, Alex, who is 10 or 11 years old. Astra hates Shaun Donnelly/Freesciencelessons.