Why Does the Butterfly Nebula Look Like This? By Nancy_A
A color rendition of NGC 6302, the Butterfly Nebula, created from black-and-white exposures taken by the Hubble Space Telescope in 2019 and 2020. In the violet-colored regions, strong stellar winds are actively reshaping the nebular wings over the past 900 years. The other features range in age from 1200 to 2300 years. Credit:
However, Balick and his former student Lars Borchert , now a graduate student at Aarhus University in Denmark, compared two exposures of the Butterfly Nebula taken by the Hubble Space Telescope in 2009 and 2020. They noticed dramatic changes in the material within the wings. The researchers said that powerful winds are driving complex alterations of material within the nebula’s wings.
Balick said the quickly changing interior structure is not easy to explain using existing models of how planetary nebulae form and evolve. The star at the center of the nebula, which is hidden by dust and debris, could have merged with a companion star or drew off material from a nearby star, creating complex magnetic fields and generating the jets.
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