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Probing moon formation

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

How Earth Got its Moon

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.

Spacetime ripples found at last

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

Doing the wave

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.
SWEET SUCCESS  For the first time, physicists have directly observed gravitational waves, caused by two black holes colliding (illustrated here).

Making Waves

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).