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Valleys of volcano lava under the surface of the Moon

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An exciting new discovery's been made on the Moon.

Sounds crazy but scientists from the US space agency NASA have been studying satellite images and say they've spotted a huge rectangular feature buried beneath the surface.

The 2,500km-wide structure is thought to be the remains of ancient valleys that later became filled with lava from the moon's volcanoes.

Here's Jenny with the details.