Shoot off rockets powered by gas pressure, generated by various means.
Science content (2016 curriculum):
Chemistry: States of Matter, Properties of Materials (K-7)
Physics: Motion and Forces, Newton’s Laws, Gravity (K, 2, 6)
Earth/Space: Extreme Environments, Space Exploration (6)
Curriculum connection (2005 science topic):
Physical Science: Force and Motion (grade 1)