PSR J1719-1438 b is a planet made of compressed carbon, 4,000 light-years away from Earth, about the size of Jupiter, but 20 times denser, and the remnant core of a white dwarf. Other unusual planets include OGLE-2005-BLG-390L b, the coldest known planet, and WASP-12b, the hottest known planet. HAT-P-1 is wider than Jupiter but lighter.
The planet PSR J1719-1438 b consists mainly of compressed carbon, or diamond. It is about 4,000 light-years away from Earth and about the same size as Jupiter, although it is 20 times denser. The planet is actually the remnant core of a white dwarf that was part of a binary pulsar system. When the other side of the system went supernova, PSR J1719-1438 b became a white dwarf and stabilized in its present form.
Learn more about PSR J1719-1438 b and other unusual planets:
PSR J1719-1438 b actually has a very close orbit around its host star, such that its entire orbit would fit inside the Sun.
The coldest known planet outside the Solar System is OGLE-2005-BLG-390L b, which is about five times the size of Earth and has a surface temperature of minus-364° Fahrenheit (minus-220° Celsius). The hottest known planet is WASP-12b, which is about 4,000° Fahrenheit (about 2,200° Celsius).
The planet HAT-P-1 is about 1.75 times wider than Jupiter, but is thought to be lighter than a cork ball of the same size would weigh.
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