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, 17:32, June 11, 2018
{{Night Sky
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| distance =25,000 ly
| constellation =Ophiuchus
| type =Diffuse nebula
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The '''double helix nebula''', not to be confused with the [[helix nebula]], is a [[diffuse nebula]] known for its double helix structure, similar to [[DNA]].<ref name=nasa>[https://www.nasa.gov/vision/universe/starsgalaxies/milkyway_twist.html Scientists Report an Odd Twist Near Milky Way Center] from nasa.gov</ref> The nebula is situated 300 light years from the centre of the [[Milky Way|galaxy]]. It is 80 [[light year]]s long and the two columns of [[gas]] and dust perform 1.25 full turns.<ref name=nasa/><ref name=arxiv>Morris, M., Uchida, K. and Do, T. (2006). A magnetic torsional wave near the Galactic Centre traced by a ‘double helix’ nebula. ''Nature'', 440(7082), pp.308-310. [https://arxiv.org/abs/astro-ph/0512452 arXiv:astro-ph/0512452]</ref> The nebula has been observed in the [[infrared]] by the [[Spitzer Space Telescope]] due to the obscuring effects of intervening [[dust]].
The nebula's unique structure is thought to be the result of a "torsional Alfven wave" and strong [[magnetic field]]s near the centre of the Mily Way.<ref name=arxiv/><ref>[https://www.space.com/2157-cosmic-dna-double-helix-spotted-space.html Cosmic 'DNA': Double Helix Spotted in Space] from space.com</ref> These fields are thought to be on the order of 1,000 stronger where the double helix nebula is found than where our own [[Solar System]] is situated. Large numbers of [[red giant|red giant stars]] can be found in this region of space.
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]