Material Detail

A guided investigation using actual NASA Kepler observations of TrES-2, an already known transiting planet system. Learners examine recurring brightness dips, estimate an orbital period, explore phase folding and calculate an approximate planet-to-star radius ratio from transit depth.

The activity emphasizes evidence and uncertainty: phase folding rearranges existing measurements, and repeated dimming alone does not confirm a planet. Worked examples explain the effects of sampling, measurement-window choices and simplifying assumptions, with links to the published discovery evidence.

Designed for ages 14+ through introductory college, the core activity takes approximately 30-45 minutes and uses basic arithmetic, percentages and square roots. Resources include an interactive browser-based lab, a four-page printable learner and educator packet, downloadable observations, source documentation and an offline reproducibility kit. Spreadsheet analysis and Python verification are optional extensions. No account or purchase is required to use the activity.

AI tools assisted with development. Data provenance, processing methods, assumptions and limitations are documented for inspection and independent checking.

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