What is an eclipse?
On rare occasions the Sun, the Moon and the Earth are in line with each other. The Moon blocks the light from the Sun, casting a shadow 160 km (100 miles) wide on the Earth. The affected area is plunged into darkness in what is known as a solar eclipse. Because the Earth and the Moon are on the move, solar eclipses last for only 71/2 minutes.

Solar eclipse
When the Earth, the Moon and the Sun are in line, the Moon casts a shadow over part of the Earth's surface.

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