We’re send­ing LunaH-Map to the moon to sniff out just how much hydro­gen is beneath the sur­face. And we’re look­ing for hydro­gen because it’s a key com­po­nent of water. Water is geo­log­i­cal­ly inter­est­ing on the moon. How did it get there? It’s also impor­tant for future human explo­ration, since it could be used as fuel.