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"extract": "H1504+65 is an enigmatic peculiar star in the constellation Ursa Minor. With a surface temperature of 200,000 K (360,000\u00b0F) and an atmosphere composed of carbon, oxygen and 2% neon, it is the second hottest white dwarf ever discovered, with only RX\u2009J0439.8\u22126809 being hotter. It is thought to be the stellar core of a post-asymptotic giant branch star, though its composition is unexplainable by current models of stellar evolution.",
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"extract": "H1504+65 is an enigmatic peculiar star in the constellation Ursa Minor. With a surface temperature of 200,000 K (360,000\u00b0F) and an atmosphere composed of carbon, oxygen and 2% neon, it is the second hottest white dwarf ever discovered, with only RX\u2009J0439.8\u22126809 being hotter. It is thought to be the stellar core of a post-asymptotic giant branch star, though its composition is unexplainable by current models of stellar evolution.",
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"extract": "A white dwarf is a very dense type of star: in an Earth-sized volume, it packs a mass that is comparable to the Sun. A white dwarf radiates light from residual heat, not from nuclear fusion. Stars like the Sun, whose mass is not high enough to collapse into a neutron star or black hole, are expected to become white dwarf stars later in their evolution. The nearest known white dwarf is Sirius B, at 8.6\u00a0light years, the smaller component of the Sirius binary star.",
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"extract": "Ursa Minor, also known as the Little Bear, is a constellation located in the far northern sky. As with the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the North American name, Little Dipper: seven stars with four in its bowl like its partner the Big Dipper. Ursa Minor was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, because of Polaris being the north pole star.",
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"extract": "The kelvin is the base unit for temperature in the International System of Units (SI). The Kelvin scale is an absolute temperature scale that starts at the lowest possible temperature, taken to be 0\u00a0K. By definition, the units of the Celsius scale and the Kelvin scale have the same magnitude, and any temperature in degrees Celsius can be converted to the kelvin scale by adding 273.15.",
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"text": "Astronomers documented H1504+65, a white dwarf in Ursa Minor (chart pictured) with the hottest surface temperature known at the time, at 200,000 kelvins (360,000\u00a0\u00b0F).",
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"text": "Astronomers documented H1504+65, a white dwarf in Ursa Minor (chart pictured) with the hottest surface temperature known at the time, at 200,000 kelvins (360,000\u00a0\u00b0F).",
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