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


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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. Astronomers try to explain what we...more

Phases of the Moon

The diagram shows the Moon in different positions along its orbit around the Earth. The Sun is far away and acts like a light bulb in this picture. Half of the Moon is always reflecting light from the...more

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