Pulsar J1719-1438 is a tiny, dead neutron stars that is only around 20 kilometers (12.4 miles) in diameter and spin hundreds of times a second, emitting beams of radiation.



Pulsar Star J1719-1438's beam of radiation regularly sweep the Earth and have been monitored by telescopes in Australia, Britain and Hawaii, allowing astronomers to detect modulations due to the gravitational pull of its unseen companion planet.

This unseen companion planet is far denser than any other known so far and consists largely of carbon. Because it is so dense, scientists calculate the carbon must be crystalline, so a large part of this strange world will effectively be diamond.

The measurements suggest the planet, which orbits its star every two hours and 10 minutes, has slightly more mass than Jupiter but is 20 times as dense. The planet (diamond planet) is far denser than any other known so far and consists largely of carbon. Because it is so dense, scientists calculate the carbon must be crystalline, so a large part of this strange world will effectively be diamond.

Just what this weird diamond world is actually like close up, however, is a mystery.