Fictional depictions of Mercury, the innermost planet of the Solar System, have gone through three distinct phases. Before much was known about the planet, it received scant attention. Later, when it was incorrectly believed that it was tidally locked with the Sun creating a permanent dayside and nightside, stories mainly focused on the conditions of the two sides and the narrow region of permanent twilight between. Since that misconception was dispelled in the 1960s, the planet has again received less attention from fiction writers, and stories have largely concentrated on the harsh environmental conditions that come from the planet's proximity to the Sun.[1]
From 1893 to the 1960s, it was believed that Mercury was 1:1 tidally locked with the Sun such that one side of Mercury was always in sunlight and the opposite side always in darkness, with a thin band of perpetual twilight in between; numerous works of fiction written in this period portray Mercury in this way.[1][3][4] Examples include Ray Cummings' 1930 novel Tama of the Light Country where the inhabitants of Mercury live their lives under an unmoving Sun,[2]Clark Ashton Smith's 1932 short story "The Immortals of Mercury" where there are two different hostile species on the planet,[1][3][9]Isaac Asimov's 1942 short story "Runaround" (later included in the 1950 fix-up novel I, Robot) where a robot is sent to retrieve critical supplies from the inhospitable dayside and malfunctions,[1][4]Hal Clement's 1953 novel Iceworld where aliens accustomed to much higher temperatures than those found on Earth set up camp on the hot dayside of Mercury,[10] Asimov's 1956 short story "The Dying Night" where a character who has spent a long time on Mercury is used to there being areas in permanent darkness,[4]Alan E. Nourse's 1956 short story "Brightside Crossing" which depicts an attempt to cross the illuminated side of the planet "because it's there" as a feat similar to the then-recent first successful ascent of Mount Everest in 1953,[1][3]Poul Anderson's 1957 short story "Life Cycle" where there is a species that changes from female to male when it goes from the nightside to the dayside and vice versa,[4]Kurt Vonnegut's 1959 novel The Sirens of Titan where there are lifeforms in caves on the nightside that live off of vibrations,[2][3][11] and Eli Sagi [he]'s 1963 novel Harpatkotav Shel Captain Yuno Al Ha'kochav Ha'mistori (English title: The Adventures of Captain Yuno on the Mysterious Planet) where the inhabitants of the respective hemispheres are at war.[12]Larry Niven's 1964 short story "The Coldest Place" depicts the nightside of Mercury and may be the last story of a tidally locked Mercury; between the time the story was written and when it was published, it was discovered that the planet is not tidally locked—it actually has a 3:2 spin–orbit resonance such that all sides regularly see daylight.[1][3][4][13]
Modern depictions
A clement twilight zone on a synchronously rotating Mercury, a swamp-and-jungle Venus, and a canal-infested Mars, while all classic science-fiction devices, are all, in fact, based upon earlier misapprehensions by planetary scientists.
Even after it was discovered that Mercury is not tidally locked with the Sun, some stories continued to use the juxtaposition of the hot daytime side facing the Sun and the cold nighttime side facing away as a plot device; the 1982 short story "The Tortoise and O'Hare" by Grant Callin portrays an astronaut who struggles to stay on the night side of the terminator line in order to avoid dying from the heat of the dayside,[4] and both the 1985 novel The Memory of Whiteness by Kim Stanley Robinson and the 2008 novel Saturn's Children by Charles Stross depict cities that move to stay in the sunrise area where it is neither too hot nor too cold.[1][2][11][15] In general, however, most modern stories focus on the generally harsh conditions of the planet.[1] Said science fiction scholarGary Westfahl in 2021, "Barring some unexpected discovery, however, science-fictional visits to Mercury will probably remain uncommon".[1]
^Roberts, Adam (2005). "Eighteenth-Century Science Fiction". The History of Science Fiction. Springer. p. 78. ISBN978-0-230-55465-8. Didacticism does not overpower Le Chevalier de Béthune's Relation du Monde de Mercure ('An Account of the Planet Mercury', 1750); a work of early SF unusual in not using the description of an imaginary Mercurian society as a vehicle for political satire or utopian fantasy or satire.
^Darlington, Andrew (Spring 1995). Lee, Tony (ed.). "I Remember Hell Planet: The Bizarre History of Mercury in S.F.". The Planets Project: A Science Fictional Tour of the Solar System. The Zone. No. 2. pp. 30–33. ISSN1351-5217.
Caryad; Römer, Thomas; Zingsem, Vera (2014). "Die Gefahrenwelt − Geschichten über Merkur" [The Danger World – Stories About Mercury]. Wanderer am Himmel: Die Welt der Planeten in Astronomie und Mythologie [Wanderers in the Sky: The World of the Planets in Astronomy and Mythology] (in German). Springer-Verlag. pp. 58–59. ISBN978-3-642-55343-1.