Its a matter or resolving power and contrast. Galaxies are large and bright. Planets in nearby star systems are small and dim. Binary systems (or multiple systems including other solar systems) are very close to each other - too close to resolve. It would be like asking Hubble to resolve a star in a galaxy at the edge of the observable universe.If we can take snapshots of other galaxies, why can't we get clear pictures of nearby star systems?
Even though the galaxies are really far away, they are still a lot brighter than planets in nearby solar systems. And that's what it all comes down to - how big it is and how bright it is.
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