PART ONE, meteor/fireish planetimage size 400*400 or bigger (same height and lenght)
make a new layer and fill with black, mess around with the lasso tool about 30-60 times through the image and cut that out, you get something like this

now add a 1 pixel white outline to the black layer (select,grow 1 px, make a new layer under black one, fill with white)
merge the 2 layers and blur with 1

now make it to a ball form, play with the rotation options a bit (not sure where this is, in filters anyway, maybe some1 could help me out)

now you have to do the 1 pixel white outline again to the ball and merge them together, blur, colorize and give it a contrast (yellow)
give it a pixel stretch and copy layer and colorize to red and change lightning mode to anything you want.
merge all meteor layers
selest area of them, render a plasma 5.0+ and colorize to red
add some contrast and set blending mode to umm.. ''screen'' or anyways the 5th from up
you get about something like this

(changed background to black, try to get white out off the red plasma)

PART TWO: the ''lines''
add a new layer ''black'' and fill with black (changed background to white to help you out, keep it black or trans if you want to)
take the circle eclipse whatever tool and select a big circle and cut it out of the image:

use the script fu called something like ''glowing hot'' (straight translation) or something like that
remove the black ''background'' layer you get with the script, and alpha selection on the ''black'' layer and then select the layer with the red yellow glow and press ctrl k or x or whatever it is to cut that part out.
blur with 3. heres what you get:

finally add some stars or whatever you like
you can check out my result in art galleries a topic named ''a meteor thing'' or close to that :a: which went much better than result pic of me (http://www.gimptalk....?a=v&t=1328&f=3)
some tips:
you can add a lighning effect on the yellow meteor layer in the middle of the ball (lightning effects lightning or something)
you can make more than 1 red-yellow line and use some motion blurs/pixel stretches on them
add some stars and white novas to the background
you can give the black sharp things (first pic) a plasma render that you desaturate to get more sharp and deeper colors on the meteor

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