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**Earth and space science**

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This is a lesson about the path meteorites take to get from the asteroid belt to Earth and how rare it is for the Earth to be hit by a large asteroid. Three activities comprise the lesson. Learners will draw circles and ellipses to illustrate basic... (View More) shapes of orbits in the solar system (Activity A); construct a scale-model of the inner solar system, observe relative distances and sizes, plot paths meteoroids might take and manipulate models to demonstrate the ecliptic plane (Activity B); and graph the locations of Earth and a near-earth asteroid, observe the significance of time and space, and estimate when the asteroid might cross the orbit of Earth (Activity C). Activities, vocabulary words, and experimental extensions are included. This is Lesson 4 of 19 in Exploring Meteorite Mysteries. (View Less)

Learners will calculate the diameter of the Moon using proportions. This activity is in Unit 1 of the Exploring the Moon teachers guide, which is designed for use especially, but not exclusively, with the Lunar Sample Disk program.

Materials Cost: 1 cent - $1 per group of students

Learners will use simple sports balls as scale models of Earth and the Moon. Given the astronomical distance between Earth and the Moon, students will determine the scale of the model system and the distance that must separate the two models. This... (View More) activity is in Unit 1 of the Exploring the Moon teachers guide, which is designed for use especially, but not exclusively, with the Lunar Sample Disk program. (View Less)