Galileo Galilei's "The Phases of the Moon"
Image courtesy of Biblioteca Nazionale - Florence, Italy


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Learn about Earth and space science, and have fun while doing it! The games section of our online store includes a climate change card game and the Traveling Nitrogen game!

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Traveling Nitrogen Classroom Activity Kit

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

Understanding the Sky

People have been wondering about what they see in the sky for a long time. Because of our curiosity about the sky, we tell stories and myths about what we see there. The desire to explain what we see around...more

Phases of the Moon

The diagram shows the Moon in different positions along its orbit around the Earth. The Sun is off in the distance, lighting the Earth-Moon system. At any position, half of the Moon is illuminated by the...more

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Megalodon shark's teeth are available in our online store, along with other minerals and fossils, books, activities, jewelry, and household items.

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