#3 55 Cancri E - A Diamond Planet (1 photo)
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20 Strange Planets That Are Both Interesting And Terrifying
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55 Cancri E is only about 40 light-years away from us in the Cancer constellation. It is twice the size of Earth but is nearly 8 times more massive and twice as dense. The parent star has much more carbon than our own sun, and the mass of the planet is thought to be largely carbon. Due to the pressure and average maximum surface temperature of 4417 °F (2400 °C), this 'super-Earth' is believed to be covered with diamonds. It is so close to its parent star it takes a mere 18 hours for the planet to complete a full orbit.
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