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Another star that orbits close to its host stars, taking under 18 hours to complete an orbit, 55 Cancri e is also inhospitably hot—reaching temperatures as high as 4,172 degrees F (2,300 degrees C). But what really sets this world apart is its composition, which makes the exoplanet, formally known as Janssen, perhaps the most conventionally valuable object in the universe.

The fact that 55 Cancri e is twice the size of Earth, but has almost 9 times the mass, led astronomers to propose that this Super-Earth could be composed of high pressurized carbon in the form of graphite and diamond mixed with some iron and other elements, according to NASA.