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In this hands-on activity, students analyze the data on Mystery Object Cards, observe that astronomical objects have many observable properties, and discover that these properties allow scientists to categorize astronomical objects into different groupings. Students also discover that, because objects can be grouped in different ways, discrete categorization is not always possible. This is why scientists need time to fully study and understand celestial objects and phenomenon. This is activity one in the "Gamma Ray Burst" educational unit. It accompanies a wallsheet that uses gamma-ray bursts as an engagement tool to teach topics in physical science and mathematics. In addition to the activities, the wallsheet features background information, assessment information, student worksheets, and extension and transfer activities.