Astronomers at Yale University have discovered a planet twice the size of earth -- and about a third of it is diamond.
The planet is named 55 Cancri e. Scientists say it's orbiting a star that can be seen in our night sky.
But the planet is more than a hop, skip and a jump away, situated 40 light years from Earth in the Cancer constellation.
“This is our first glimpse of a rocky world with a fundamentally different chemistry from Earth,” said lead researcher Nikku Madhusudhan, a Yale postdoctoral researcher in physics and astronomy, in a statement.
“The surface of this planet is likely covered in graphite and diamond rather than water and granite.”
The planet's radius is twice the size of earth, but it weighs 8 times the mass of our planet. It's also unbearably hot: Surface temperatures can climb as high as 1,648°C.
Scientists say the planet orbits at "hyper speed", with a year lasting a mere 18 hours.