Asimov’s Kalgash: a planet in permanent daytime (for real this time!)

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….


A cigar from another star

In Rendezvous with Rama (by Arthur C. Clarke), a mysterious object is discovered passing through the Solar System.  The object has a strange shape — it’s a giant cylinder.  It was discovered by the Spaceguard survey, designed to find objects that might impact Earth (so-called near-Earth objects).  Spoiler alert: the cylinder is a spaceship sent…