Photo: Volcanic Explosion on Mars Created Weird Formation

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A false-color image taken by the Mars rover Spirit shows a small rock "bomb" (indicated with arrow) and the impact "sag" it made in the Martian surface. The bomb is about 1.6 inches (4 centimeters) wide. Scientists say the rock may have been jettisoned by a volcanic eruption, leaving what one researcher called the first "powerful evidence of explosive materials" on Mars.

Image © Science

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