"10 Fascinating Insights into Halley's Comet's Highly Anticipated Return"

As Halley's Comet makes its comeback, here are 10 fun facts about it: it was first recorded in 240 B.C.E., Halley's questioning Newton led to the Principia, Halley identified three prior returns, its orbit is variable, Halley never observed its return, its return led to the Messier catalog, its orbital speed varies tremendously, its debris creates two meteor showers, it's not the most common comet type, and its nucleus may soon split.