Pern was world poor in metals so the colonists were prepared to abandon most technology and focus on an agrarian society. What the survey probes failed to report was that a planet with an erratic elliptical orbit would pass close enough for the it's voracious "threads" to cross over to Pern where they would devour any organic life they fell on. The colonists were too far from Earth for a message to summon help in time and the ships that brought them to Pern lacked enough fuel to take them somewhere else so they had to improvise. They began carving out massive caves for shelter while their geneticists worked with the native flying fire-breathing lizards to enlarge them and enhance their telepathic ability. The dragonriders of Pern were born and their lives revolved around burning the threads from the sky before they could reach the ground and caring for the dragons they bonded with. Every few hundred years the planet they called the Red Star would be out of range for four hundred years. During one of these long breaks the people hoped the Red Star wouldn't return and they neglected the tithes of necessary goods that supported the dragonriders and Holds warred with each other. Where there had once been several volcanic weyrs of dragonriders there was only one and it's only queen dragon died after laying her last clutch of eggs. The only hope for those who remembered their duty was the golden egg of a queen and the hope that they could find a strong willed woman worthy of bonding that queen. Without a queen there would be no more dragons and the Red Star is growing brighter in the morning sky.
Dragonflight - the award winning start of the legendary fantastical sci/fi series, The Dragonriders of Pern