Wednesday, December 22, 2010
Zippershare Pump Up Music
The disturbing Hourglass Nebula is located in the constellation of Muska, about 8000 light years away. Its dramatic form, the theory of formation of planetary nebulae is due to a stream of rapidly expanding stellar wind within a dense cloud of slow expansion. The sun-like star at its center has consumed all its fuel and is dying, so that its outer layers are being expelled while the core cools, creating another small hourglass nebula and becoming a white dwarf. The expanding rings are clouds of nitrogen (red), helium (green) and oxygen (blue) that were detected multiple stellar objects associated with star formation, though initially it was thought that the nebula was symmetrical, star- appears slightly off-axis. This fact also observed in some galaxies, still no explanation, but theories point to a massive star or a black hole invisible as possible causes.
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