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http://media.comicvine.com/uploads/3/35698/760064-nebulon_head_large.jpg

vs

PC GG
http://media.comicvine.com/uploads/0/229/135913-188033-galactic-golem_large.jpg
Post Crisis
http://media.comicvine.com/uploads/1/12075/720344-superman_variant_cover_by_renatoguedes_large.jpg

If i remember my defendera the celestial man has been shown to fight the defenders ( who are way more powerfull then the avengers) which included hulk and sinister hyperion... thus i think nebulon has a good chance against the golem.