Mystery of the ‘butterfly’ nebulae alignment › News in Science (ABC Science)

Astronomers have discovered something weird in the Milky Way’s galactic bulge – a population of planetary nebula are all mysteriously pointing in the same direction.

They noticed the mysterious alignment in the long axes of bipolar planetary nebulae.

Planetary nebulae are caused by the death of red giant stars. During their final years, long after the hydrogen fuel has run out in their cores, these puffed up stars begin to shed their outer layers, blasting huge quantities of material into space.

via Mystery of the ‘butterfly’ nebulae alignment › News in Science (ABC Science).

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