Using the Spitzer Space Telescope NASA astronomers have
observed that planetary systems - dusty disks of asteroids, comets and possibly
planets - are so abundant in double star systems as single stars in systems
such as ours. Since more than half of all stars are twins, or binaries,
the finding suggests that the universe is full of planets with two
suns. Sunsets on some of those worlds would resemble that of Luke
Skywalker's planet, Tatooine, where two fiery balls dip below the horizon one
by one.
