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Eta Carinae, though the Hubble has taken quite a nice photo of it already. Same goes for the Eagle and Orion nebulae and the star forming regions in the Large and Small Magellanic Clouds.
keywords: Telescope,look,week,you,what,were,If,would,Hubble,to,for,control,or,able,at,the,If you were able to control the Hubble Telescope for 1 week what would you look at (or look for)