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This research-focused guide is inspired by the International Science and Engineering Fair, or ISEF, the world's largest international pre-college science competition.

Students will calculate the angular momentum and density of the moon and consider the implications of the results for various theories of the moon's origin.

Students will search the Science News archive for other stories related to moon formation.

These questions focus on ideas about the origin of Earth's moon and evidence that supports various explanations of its formation.

This guide explores scientists' ideas for how the Earth got its moon, and the evidence that supports those ideas. Students can even calculate relevant lunar properties for themselves.

These questions focus on gravitational waves, gravitational wave detectors and how observing gravitational waves can improve our understanding of the universe.

These discussion prompts cover the general properties and types of waves, how humans and other animals detect waves, and the design of laboratory wave detectors.

This guide focuses on one big discovery in 2016 (the detection of gravitational waves) and one hot topic (the challenges in developing and embracing self-driving cars).