In the problem-based laboratory activity described here, students evaluate the causality of changes on the solar surface in regard to climate change and warming in Earth’s environment. They use graphing calculators and real-time data from the internet to research the possible effects of sunspot activity on ocean temperatures in the Atlantic. The 5E constructivist instructional model—Engage, Explore, Explain, Elaborate, and Evaluate (Bybee 1997)—is used to analyze a false hypothesis linking sea-surface temperature to the Sun.