Does Suisei no Gargantia have a manga? After watching Suisei no Gargantia, I have been looking like crazy for the manga, but have been unsuccessful in doing so. Is there a manga version of this anime?
Yes, there is. According MAL, it seems like it started publishing on Jan 10, 2013. 


  A manga adaptation began serialization in the January issue of the Newtype Ace magazine. It is produced by the Oceanos team and drawn by Wataru Mitogawa. (Wikipedia)