Planets may orbit binary stars.

[kidflash2008]

The sunset of the planet Tatooine in Star Wars may be a reality to some planets after all:

http://blogs.usatoday.com/sciencefai...o-sunsets.html

It seems they have found a planetary disk and dust circling a binary star system. This would increase the likely planets by a huge amount. It also means planetary systems are common throughout the universe.