Here is a terrific science lesson for your elementary schoolers. In it, learners analyze different materials to simulate space radiation shielding on spacecraft, then select the best material to use to build one. This is a classic lesson; it is written beautifully, and everything you need to successfully implement it with your class is here. Terrific worksheets, websites, and a rubric you can use to score student work are all embedded in this fine 10-page plan.