Map editor crash

I have working on a very detailed version of the Star Wars galactic map. I'm 50-60% done but its crashing in map editor when I try to open it.

 

I'm using this map...

http://collider.com/wp-content/uploads/star-wars-galaxy-map.jpg

 

Can anyone tell me why it's crashing?

What is the MAX star / planet count for a map?

 

Thanks.

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