Halley's Comet was a comet of the Sol system.
A time travel incident brought Samuel Clemens from San Francisco in August 1893 to a short visit on the decks of the USS Enterprise-D in 2369. Clemens was curious as to whether the starship had ever reached Halley's Comet. (TNG: "Time's Arrow, Part II")
In the late 20th century, Halley's Comet appeared in the design of the mission insignia for the space shuttle orbiter mission STS-51L. (ENT: "First Flight", set artwork)
In 1996, the Griffith Observatory featured an exhibit about Halley's Comet. In order to get from Rain Robinson's lab to the lobby, one had to "go right down the hall, take a left at Mars, right at Halley's Comet and then just keep going straight ahead past the soda machine". (VOY: "Future's End")
Background information[]
This comet has a regular orbit of approximately 76 years. Halley's Comet was often visible from Earth's surface when nearing perihelion, its point of least distance from Sol. Two of Halley's appearances marked the years of the birth (1835) and death (1910) of the famous American writer Samuel Clemens. After 1910, Halley's Comet's perihelia occurred, or will occur, on:
Given the gravitational effect of the Sol system planets on the comet, it is nearly impossible to predict accurately the dates of Halley's perihelia past 2134.