This is an activity about the rotation of the Moon. Learners use a penny and a quarter to model that the Moon does indeed spin on its axis as it orbits the Earth. They find that the Moon keeps the same face toward the Earth, but receives... (View More) illumination from the Sun on all sides in turn. This activity is part of Explore! Marvel Moon, a series of activities developed specifically for use in libraries. (View Less)

This is an online sorting game that compares the lifetime risk of death from an asteroid impact to other threats. For example, are you more likely to be killed by an amusement park ride or an asteroid impact? It is part of the Killer Asteroids Web... (View More) Site. The site also features a background overview of the differences between asteroids and comets, information on different types of asteroids (rubble piles vs monoliths), a discussion of how at risk Earth really is to an asteroid or comet impact, and background information on light curves. (View Less)