Image: Facebook/ESA – European Space Agency

Millions of miles out into the solar system, a probe travels in orbit around Mars. Launched in June 2003, it has been circling the Red Planet ever since, beaming back images of the alien terrain below. But the craft has captured one series of images in particular that captivated the world – and you might find the explanation behind them difficult to believe.

Image: Photo12/Universal Images Group via Getty Images

Ever since it left Earth, the Mars Express mission has been revealing staggering truths about the mysterious planet. Then in December 2018 researchers on the ground announced another fascinating revelation. Over the course of several orbits, you see, the probe had put together a picture of a unique landmark known as the Korolev Crater.

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