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Possibly this is the first discovered quark star, an object between neutron star and black hole. The neutrons couldn't resist the pressure of its gravitation and got cracked. Remaining are the quarks. But the escape speed is still lower than the speed of light, so the star glows. Its surface temperature is 700 000 kelvin.

Constellation: Corona Australis
Age: 1 million years
Distance: circa 450 light-years
Mass: 0.9 * Sun
Diameter: 3.8 - 8.2 kilometers

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    RX-J185635-375, A Quark Star
Photo: Eso

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