Let’s find out what it takes to build a system in which a planet remains in perpetual daylight, except for once every few thousand years….

Isaac Asimov‘s sci-fi stories are one reason I wanted to become an astronomer (I talked about this in a recent interview). So I’m a little sad to shoot down a classic…. Nightfall is a classic Asimov story (and later, novel). The residents of a planet called Kalgash live in system of six stars that leaves…

We Earthlings have just one Sun.  Tatooine has two.  Wouldn’t it be even cooler with three Suns in the sky?  Or four or five or twenty? Several extra-solar planets have been found in triple- and even quadruple-star systems (for example, GJ 667C and PH1b).  But none of these planets has more than two Suns because…