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Space really is still very much a mystery.

It’s big, it’s dark and it’s cold. Despite it’s massive size, however, we still haven’t found any concrete evidence of alien life. But astronomers have discovered many other mind-blowing things about the ever-expanding universe we live in. And trust us, they will make you question everything you thought you knew about the final frontier.

When NASA’s New Horizons spacecraft whipped by Pluto last summer, it discovered a heart-shaped structure on the surface of the dwarf planet (it’s on the bottom right of the image). Strangely, that structure also functions just like a real human heart which, in a sense, helps keep the planet alive. The 900,000 square kilometre area is called Sputnik Planum, and features reservoirs below its surface filled with glaciers of frozen gases. When this ice is warmed by Pluto’s internal heat, it bubbles to the surface in blobs–much like the pumping of blood in the human body. This liquid then refreezes once it hits the colder exterior, helping to restore the surface of the planet.

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