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Mona Evans
Mona Evans • 31 weeks ago

Eskimo Nebula NGC 2392. (Credit: Andrew Fruchter (STScI) et al., WFPC2, HST, NASA) It was discovered by William Herschel in 1787. We now know that it's a planetary nebula, one that firns when a sun-like star, at the end of its life, loses its outer layers. It's about 1/3 of a light year across and located 3000 light years away in the constellation Gemini. Mona Evans, “Nebulae” www.bellaonline.c...

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Abell 36 lies 800 light-years away in the constellation of Virgo. At that distance it spans over 1.5 light-years in this sharp view. Shrugging off its outer layers, the nebula's central star is contracting and becoming hotter, evolving towards a final white dwarf phase. In fact, in Abell 36, the central star is estimated to have a surface temperature of over 73,000 K, compared to the Sun's present 6,000 K temperature. As a result, the intensely hot star is much brighter in ultraviolet light