Orbiting a star that is visible to the naked eye, astronomers have discovered a planet twice the size of our own made largely out of diamond. The rocky planet, called '55 Cancri e', orbits a sun-like star in the constellation of Cancer and is moving so fast that a year there lasts a mere 18 hours.
Discovered by a U.S.-Franco research team, its radius is twice that of
Earth's with a mass eight times greater. That would give it the same
density as Earth, although previously observed diamond planets are
reckoned to be a lot more dense. It is also incredibly hot, with
temperatures on its surface reaching 3,900 degrees Fahrenheit (1,648
Celsius).
The surface of this planet is likely covered in graphite and diamond
rather than water and granite, said Nikku Madhusudhan, the Yale
researcher whose findings are due to be published in the journal
Astrophysical Journal Letters.
The study - with Olivier Mousis at the Institut de Recherche en Astrophysique et Planetologie in Toulouse, France - estimates that at least a third of the planet's mass, the equivalent of about three Earth masses, could be diamond.
Diamond planets have been spotted before but this is the first time one
has been seen orbiting a sun-like star and studied in such detail.
Source: Agency
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