The image reveals two 'caps' of less ionised material at the edge of the nebula
Should it be read as that the material in these regions are less ionised compared to other regions; or that the concentration of ionised particles is lower, or something else?
If it is singly ionized nitrogen; does it have to be mentioned at all? In such case it is already mentioned in the text that green represents singly ionized nitrogen. Gunnar Larsson 19:03, 14 September 2006 (UTC)
Could someone please explain the discrepancy between the distance of 3300lj and the stated upper limit of the age for NGC6543 of only 1000 years? We would not be able to see this nebula if those values were correct. —Preceding unsigned comment added by 22.214.171.124 (talk) 12:22, 8 May 2011 (UTC)