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Although popular in science-fiction, multiple sun solar systems were long thought to be impossible. Just twenty years ago, computers were showing that planetary orbits don’t seem to be stable in multiple sun systems.

Then, in 2006, Deepak Raghavan (Georgia State University) found that 29 of the then known extra-solar planets were in systems that have more than one sun. That number has now grown to about 50 planets being in that kind of system.

"Over one fifth of the extrasolar planetary systems are in multiple sun environments," Raghavan said in an article called "Astronomers Find That Many Milky Way Planets Have Multiple Suns".

Thomas Houch said: "Simply because there are billions of stars in our own galaxy multiplied by the billions of galaxies gives odds that almost anything we can imagine exists and probably things we cannot or have not image exist. Open your minds to the possibilities..."