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Bad Astronomy | White dwarf binary stars can merge and explode


After so many years writing about astronomy, I am pleased to report that there are still things going on in the Universe that can make the hair on the back of my stand up.
Let me share a multi-part story with you about dancing dead stars, what strange beast remains after the music stops, and the sometimes explosive result.
Very explosive.
White dwarfs are the leftovers of stars like the Sun after they die. When a star like that runs out of nuclear fuel it swells up into a red giant, blows off its outer layers, and leaves behind only its intensely hot and dense core. This is the white dwarf. ....

Subrahmanyan Chandrasekhar , Type Iax , Milky Way , Nanjing Univ , Chandrax Ray Observatory , Bad Astronomy , White Dwarfs , Binary Stars , பால் வழி , நான்ஜிங் யூநிவ் , மோசமான வானியல் , வெள்ளை குள்ளர்கள் , பைனரி நட்சத்திரங்கள் ,

Bad Astronomy | A new nebula, StDr 56, has been discovered, but what is it?


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 Robert , Xavier Strottner Robert , Marcel Drechsler , Xavier Strottner , White Dwarfs , Planetary Nebulae , Crash Course Astronomy , Milky Way , Bad Astronomy , Planetary Nebula , மார்செல் திரேச்சிலேர் , வெள்ளை குள்ளர்கள் , செயலிழப்பு நிச்சயமாக வானியல் , பால் வழி , மோசமான வானியல் , கிரகங்கள் நெபுலா ,