Scientists have found evidence that there is life on Titan, the largest moon of Saturn. Primitive bacteria there may be breathing the atmosphere and feeding on the surface, which is covered with mountains, lakes and rivers. Astronomers call it the most Earthlike world in the solar system.

However, the liquid there is not water but methane, so any life there would be methane-based. Meanwhile, astronomers think that huge oceans existed on Mars around 4 million years ago. Now nothing is left of them but ice at the poles and a huge impact crater in the middle. The answer to whether the ice on Mars is water or methane will have to wait until we go there.

Canadian researchers have discovered methane-eating bacteria right here on Earth: They survive in a highly unique spring located on Axel Heiberg Island in Canada

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