Yes, though the formation process for such a system is rather difficult to construct, making such binary planet systems…
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What is Required to Send People, Satellites, or Other Objects to Explore Potentially Habitable Planets?
You can get a sense of the biggest problem with sending anything to other potentially habitable planets by checking…

Can a Moon Alternately Orbit Two Planets?
I don’t believe that the scenario you describe, were a moon is effectively shared by two planets in a…

Average Radius of Exoplanets in our Galaxy
Related to some recent questions regarding exoplanet properties, I have pointed to the Open Exoplanet Catalog as a source…

Do Some Extrasolar Planets Orbit Around Stars in Such a Way That We Cannot See Them?
We can only see the dimming of a star from a planet that crosses the face of the star…

Finding an Exoplanet System with Specific Properties
There are a number of online databases which list the properties of exoplanetary systems. One such database is the…