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Zoom In StDr 56, a possible planetary nebula in the constellation of Triangulum. It’s about the same size as the full Moon on the sky. Credit: Robert Pölz, Marcel Drechsler, Xavier Strottner See? I told you. Absolutely breathtaking. But. what is it? The quick version is, I don t know. The slightly more lengthy version is, it s a nebula, and probably a planetary nebula, but I have never seen one like this, and there are some baffling aspects of it I cannot explain. StDr 56 was discovered by amateur astronomers Marcel Drechsler and Xavier Strottner, who comb through surveys of the sky looking for planetary nebulae (or PNe) winds of gas that flow from stars like the Sun when they die, blown when the star turns into a red giant. Eventually the outer layers blow away entirely, revealing the core of the star: a hot dense white dwarf. Ultraviolet light from the white dwarf excites the gas, causing it to glow.

Astrophotographer robertXavier strottner robertMarcel drechslerXavier strottnerWhite dwarfsPlanetary nebulaeCrash course astronomyMilky wayBad astronomyPlanetary nebulaமார்செல் திரேச்சிலேர்வெள்ளை குள்ளர்கள்செயலிழப்பு நிச்சயமாக வானியல்பால் வழிமோசமான வானியல்கிரகங்கள் நெபுலா