In the Mars Launch Sequence Water Rocket unit, students become Mars expedition launch engineers as they design, build, and test a paper water rocket — investigating how fin configuration, nose cone shape, and launch angle affect flight distance and trajectory. Set inside the Mars Expedition Team narrative, this 2-week unit challenges Grade 4 students to collect controlled launch data, make one evidence-based redesign, and prepare their findings for a launch showcase. What Students Will Do* Buil