Titan (Moon)
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50 free Titan (Moon) trivia questions with answers — science & nature quiz, new questions added Aug 2026.
Titan is the moon that behaves like a planet. Bigger than Mercury, wrapped in an atmosphere denser than Earth's, and the only world besides our own with lakes and seas on its surface, it hides under an orange smog so thick that nobody saw the ground until the Huygens probe dropped through it in January 2005 and photographed ice pebbles on a dark plain. These 50 questions cover Christiaan Huygens' discovery in 1655, John Herschel's naming, the 16-day orbit and synchronous rotation, the Voyager flyby that demoted Titan from largest moon to second-largest, the Cassini-Huygens mission and its radar maps, the nitrogen and methane atmosphere, the 94-kelvin surface, the methane cycle that mimics Earth's water cycle, Kraken and Ligeia Mare, the dune fields and the Australia-sized bright region Xanadu, candidate cryovolcanoes like Doom Mons, the Argon-40 clue, the Hubert Curien Memorial Station, and the proposed submarines, boats and balloons that never flew. The easy tier asks which planet Titan orbits; the expert tier wants the orbital resonance with Hyperion and the name of the hypothetical methane-based cell membrane. Every answer is cited to a page we checked and comes with a short explanation. Play it solo or print it for a science-club night.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Which moon is the only one in the Solar System larger than Titan?
Ganymede
Ganymede. It is wider than Titan by only about 2 percent, and Titan's thick haze made it look the bigger of the two until a spacecraft flew close enough in 1980 to size up the solid body.
Q 02Titan is closest in size to which planet?
Mercury
Mercury. The planet is slightly narrower than Titan yet well over twice as massive, because it is mostly iron and rock while the moon is built of much lighter material.
Q 03Christiaan Huygens, who discovered Titan in 1655, came from which country?
Netherlands
The Netherlands. Huygens and his brother Constantijn built their own telescopes, and with them he also worked out that Saturn's baffling shape was really a thin, flat ring.
Q 04What Latin name did its discoverer give Titan?
Saturni Luna
Saturni Luna, also written Luna Saturni, is just Latin for Saturn's moon, since it was the only one known. Cassini later wanted the four he found named in honour of Louis XIV, but that flattery never caught on.
Q 05Who gave Titan its name in the 1800s?
John Herschel
John Herschel proposed it while naming all seven of Saturn's then-known moons, which until then had gone by numerals. His father William had discovered two of the seven himself.
Q 06Titan is Saturn VI because Saturn's early moons were numbered by what?
Orbital distance
Orbital distance. The numerals counted outward from Saturn, so Titan slipped from IV to VI when two closer moons were found in 1789.
Q 07Before Titan, every known moon beyond our own circled which planet?
Jupiter
Jupiter. Galileo had found its four big moons in 1610, and nothing was added for 45 years until Huygens caught Titan through a telescope lens he had ground himself.
Q 08The Titans who gave Saturn's largest moon its name come from which mythology?
Greek
Greek. The Titans were the brothers and sisters of Cronus, the god the Romans called Saturn, and that family tie is why they lend their names to the planet's moons.
Q 09Which small, irregular moon is locked in a 3:4 orbital resonance with Titan?
Hyperion
Hyperion. It circles Saturn three times for every four Titan orbits, and the big moon's pull keeps its path stretched instead of letting it settle into a circle, while the potato-shaped body tumbles chaotically.
Q 10Titan is about one and a half times as wide as which of these worlds?
Our Moon
Our Moon is about 3,475 km wide against Titan's 5,150 km. Titan is icy where the Moon is rock, so it has over three times the volume yet less than twice the mass.
Q 11Which spacecraft's 1980 visit showed Titan to be only the Solar System's second-largest moon?
Voyager 1
Voyager 1 sized up the solid body beneath the haze. Its course was built around that one close pass, which flung the craft up out of the plane of the planets and ended its planetary tour at Saturn.
Q 12Titan's air is so thick that a visiting astronaut could do without which piece of kit?
Pressure suit
Pressure suit. The air at the surface presses about one and a half times as hard as Earth's, so a visitor would need only something to breathe and very warm clothing, not the bulky suit worn on spacewalks.
Q 13Titan's atmosphere reaches far higher into space than Earth's, mainly because of what?
Its weak gravity
Q 21Titan is so cold its bedrock is made of what?
Frozen water
Frozen water. At about minus 180 Celsius ordinary ice is as hard as stone, so it does the job rock does on Earth, while methane takes over water's part and does the raining and flowing.
Q 22Titan's haze blocks so much sunlight that NASA's Dragonfly will run on what?
Nuclear generator
Nuclear generator. Saturn's distance cuts sunlight to a hundredth of Earth's and the haze blocks most of the rest, so the craft will recharge its battery from it through each Titan night, which lasts about eight Earth days.
Q 23What does Titan's haze produce by absorbing sunlight before it reaches the ground?
An anti-greenhouse effect
Its weak gravity. Titan holds its air so loosely that it puffs out far above the surface, and thick air plus a feeble pull means a person with wings strapped on could fly.
Q 14Titan's atmosphere was first suspected early last century when an astronomer saw that its tiny disc looked how?
Dimmer towards the edge
Dimmer towards the edge. Astronomers call it limb darkening, a telltale of gas around a body, and Josep Comas i Solà's hunch was borne out in 1944 when Gerard Kuiper detected methane there.
Q 15Which gas makes up most of Titan's atmosphere?
Nitrogen
Nitrogen. Titan is the only known world besides Earth wrapped in a thick blanket of it, though the runner-up there is a few percent of methane where Earth has oxygen.
Q 16The Huygens probe's own warmth showed that the ground beneath it was what?
Damp
Damp. The probe's instruments sniffed methane boiling off as its warmth soaked into the soil, and heat drained away so fast that the ground had to be wet, like sand after rain.
Q 17What colour is the smog that hydrocarbon reactions create in Titan's upper atmosphere?
Orange
Orange. Sunlight splits methane high up and the fragments recombine into a smog so thick that ordinary cameras cannot see the ground, which stayed hidden until radar and infrared mapped it.
Q 18Sunlight steadily destroys Titan's methane, so researchers suspect the gas is topped up by what?
Ice volcanoes
Ice volcanoes. They would belch chilled water and gas instead of molten rock, and the idea is needed because sunlight should long ago have used up Titan's methane, yet no eruption has been caught in the act.
Q 19What are the complex organic chemicals thought to form in Titan's atmosphere called?
Tholins
Tholins. The sticky gunk snows out of the haze, and it is thought to be what piles up as the dark sand of Titan's giant dune fields.
Q 20Which ingredient of household plastics did Cassini detect on Titan in 2013, a first beyond Earth?
Propene
Propene, also called propylene, is the stuff of food tubs and car bumpers. A 1980 flyby had found its lighter and heavier three-carbon cousins, and Cassini's heat sensor finally filled the gap between them.
An anti-greenhouse effect. The haze soaks up sunlight yet lets heat escape, chilling the ground, while the gases beneath it trap warmth in an ordinary greenhouse, so Titan runs both at once.
Q 24Which bright, Australia-sized region of Titan takes its name from a fabled land in an English poem?
Xanadu
Xanadu, from Coleridge's Kubla Khan. Hubble saw it in 1994 as a mere bright spot, but Cassini's radar found mountains and winding channels, a land where, as one scientist put it, rivers flow down to a sunless sea.
Q 25What is the name of Titan's largest sea?
Kraken Mare
Kraken Mare. Titan's seas are named after sea monsters, and its biggest sea took one of the biggest, the enormous kraken of Norwegian legend.
Q 26Cassini's radar passed clean through Ligeia Mare, making the first-ever detection of what on another world?
Sea floor
A sea floor. The echo came back from more than 150 metres down, which was only possible because the liquid is almost pure methane and as clear to radar as glass is to light.
Q 27Where on Titan are almost all of its lakes and seas found?
The polar regions
The polar regions, and lopsidedly so: all three seas crowd around the north pole and the south has just one large lake, while the equator between them is a belt of dry dunes.
Q 28Cassini's radar found Titan's first confirmed lakes in 2006 because calm liquid shows up in radar images as what?
Dark patches
Dark patches. A mirror-smooth surface bounces the radar beam away from the craft instead of back to it, so dozens of inky shapes with shorelines gave the lakes away, and the team announced them in January 2007.
Q 29In 2012, Titan's ten-metre tides led Cassini scientists to conclude that it hides what?
A buried ocean
A buried ocean. Stiff rock would flex by only a metre, so water under the ice seemed almost inescapable, but a 2025 reanalysis of the same data argues for thick slush with pockets of meltwater instead.
Q 30Titan's peaks, such as Erebor Mons and Mithrim Montes, are named after mountains in which fictional world?
Middle-earth
Middle-earth. Titan's mountains borrow Tolkien's peaks by international rule, Doom Mons among them, while its plains take planets from Frank Herbert's Dune and its straits characters from Asimov's Foundation.