H II region

Asked by Tanmoy Saha

Sh 2-19
Form is Circular but Structure is amorphous.
Please explain what Form means and Structure means ?

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Alexander Wolf
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Best Alexander Wolf (alexwolf) said :
#1

Form is visual form and Structure is structure of gas. Look it: http://galaxymap.org/cat/view/sharpless/19

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Tanmoy Saha (t4saha) said :
#2

Thanks Alexander Wolf, that solved my question.