A Deepness in the Sky is a science fiction novel by American writer Vernor Vinge. …
Excellent 2nd book in the Zones of Thought series
5 stars
Start with a single planet orbiting a white dwarf star nicknamed the OnOff star because it is consistently dormant 215 out of every 250 years. Add in a sentient species that survives on the planet. Finally toss in two competing, space faring groups of humans come to investigate. Mix well and enjoy the result!