42 Space Trivia Questions [With Answers]

Mercury is closer to the Sun. Venus is hotter. That single fact trips up more people than any other space trivia question.

These 42 space trivia questions on LearnClash cover planets, stars and galaxies, the Moon, NASA missions, black holes, and the misconceptions that fool almost everyone. Every answer explains exactly why it catches people off guard, with sources from NASA and the European Space Agency. Why 42? Because it’s the answer to life, the universe, and everything.

Six sections, three difficulty tiers, and the counterintuitive facts that stump even astronomy fans. Space is one of the best trivia question topics we cover across 22 categories. Test your space knowledge on LearnClash →

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Quick Overview

LearnClash sorts these 42 space trivia questions by category and difficulty so you can pick your level. The set skews toward medium and hard because easy planet questions don’t catch anyone who paid attention in school. Use the table as a jump menu.

Section	Questions	Easy	Medium	Hard
Planets & the Solar System	1-7	1	3	3
Stars & Galaxies	8-14	1	4	2
The Moon & Earth from Space	15-21	2	3	2
Space Exploration & NASA	22-28	1	4	2
Black Holes & Cosmic Phenomena	29-35	0	3	4
Space Misconceptions	36-42	0	3	4

42 space trivia questions across 6 categories. Difficulty leans medium and hard because the easy ones don’t catch anyone.

When we built the space topics in LearnClash, one pattern kept repeating: players are most wrong about the things they’re most sure of. Everyone “knows” Mercury is the hottest planet. Everyone “knows” the Great Wall is visible from space. And everyone gets both wrong.

That overconfidence is what makes the correction stick through spaced repetition. A confident wrong answer locks in the right one far better than a lucky guess.

Planets & the Solar System (1-7)

Space trivia questions about planets on LearnClash cover the eight worlds orbiting our Sun, their moons, and the counterintuitive details that trip up nearly every player. The solar system has more strange corners than most people realize, from diamond rain to a mountain three times taller than Everest.

These seven planet trivia questions start with the one that everyone misses. We saw a similar pattern in our science trivia questions, where confident answers tend to be wrong answers.

Seven planet facts that challenge what most people remember from school.

1. Which planet in our solar system has the highest surface temperature? (Easy)

Answer: Venus, at roughly 462 degrees Celsius (864 degrees Fahrenheit). Not Mercury.

Why it stumps people: Your gut says Mercury, but Mercury has almost no atmosphere. Its dark side drops to minus 180 degrees Celsius. Venus has a thick carbon dioxide atmosphere that traps heat through a runaway greenhouse effect. The entire surface stays at roughly the same scorching temperature, day and night.

2. Which planet has the shortest day in the solar system? (Medium)

Answer: Jupiter, with a day lasting just 9 hours and 56 minutes. It’s the largest planet and the fastest spinner.

Why it stumps people: Nearly everyone reaches for Mercury or Mars. But Jupiter’s enormous mass generates enough angular momentum to complete a full rotation in under 10 hours. For context, that’s a planet 1,300 times Earth’s volume spinning faster than Earth does.

3. How many confirmed moons does Saturn have as of 2026? (Hard)

Answer: 285, confirmed by the International Astronomical Union in March 2026. Saturn holds the record for most moons of any planet.

Why it stumps people: The number changes constantly. In 2019 it was 82. By March 2025 it jumped to 274 after astronomers confirmed 128 new irregular moons. Then 11 more got confirmed in March 2026. Most quiz sources still list the outdated 146 figure.

4. On which planets does it literally rain diamonds? (Medium)

Answer: Neptune and Uranus. Extreme pressure and temperature deep inside both ice giants crush carbon atoms into diamond crystals that sink toward their cores.

Why it stumps people: It sounds like science fiction. But laboratory experiments at the SLAC National Accelerator replicated the conditions in 2017 and confirmed diamond formation. Saturn and Jupiter may also produce diamond rain, though the evidence is less direct. This is one of the space trivia facts that gets the biggest reaction at trivia night.

All eight planets to scale. Jupiter alone could fit about 1,300 Earths inside it.

5. What is the tallest mountain in the entire solar system? (Medium)

Answer: Olympus Mons on Mars, standing 21.9 kilometers (13.6 miles) high. That’s roughly 2.5 times the height of Mount Everest.

Why it stumps people: Two facts collide here. People expect the biggest mountain to be on the biggest planet. But gas giants don’t have solid surfaces. Mars, with only 38 percent of Earth’s gravity, can support mountains that would collapse under their own weight on Earth.

6. Which planet rotates backward compared to most others in the solar system? (Hard)

Answer: Venus. It rotates clockwise (retrograde) while almost every other planet spins counterclockwise. On Venus, the Sun rises in the west.

Why it stumps people: Uranus also has unusual rotation, tilted 98 degrees on its side. But Venus is the only planet with a truly reversed spin axis. The cause is still debated. Leading theories include a massive ancient collision or tidal effects from its thick atmosphere.

7. On Mercury, how long is one full day-night cycle in Earth days? (Hard)

Answer: 176 Earth days. That’s longer than Mercury’s year, which is only 88 Earth days. One solar day on Mercury lasts exactly two Mercury years.

Why it stumps people: The trap is in the question itself. Mercury’s sidereal rotation (spin relative to the stars) is 58.6 Earth days. But because it orbits the Sun so fast, the solar day stretches to 176. The Sun would appear to rise, stop, briefly reverse direction, then continue across the sky.

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But here’s where it gets interesting.

Stars & Galaxies (8-14)

Space trivia questions about stars and galaxies on LearnClash push past the solar system into the deep universe, where scales stop making intuitive sense. Distances are measured in light-years. Densities crush physics. And the colors you think you know are backward.

Star colors work backward from what most people expect. Blue is the hottest. Red is the coolest.

8. What color are the hottest stars? (Easy)

Answer: Blue. Blue stars can exceed 30,000 Kelvin. Red stars, while still incredibly hot, burn at around 3,000 Kelvin. Our Sun sits in the middle as a yellow-white star at about 5,500 Kelvin.

Why it stumps people: In everyday life, red means hot and blue means cold. Faucets, stoves, warning labels. But stellar physics works the opposite way. The hotter the star, the shorter the wavelength of light it emits, and shorter wavelengths appear blue.

9. How long does sunlight take to reach Earth? (Medium)

Answer: About 8 minutes and 20 seconds. Light travels at 299,792 kilometers per second, and the Sun is roughly 150 million kilometers away.

Why it stumps people: This catches even astronomy buffs. Most people guess either “instantly” or wildly overestimate (“an hour?”). The real number is oddly specific and lands right between those extremes. So every sunrise you watch actually happened 8 minutes before you saw it.

10. What is the nearest star to our solar system? (Medium)

Answer: Proxima Centauri, at 4.24 light-years away. It’s a small red dwarf star in the Alpha Centauri triple-star system.

Why it stumps people: “Alpha Centauri” is the famous name, and many people give that as their answer. Technically they’re half right. Proxima Centauri is part of the Alpha Centauri system but sits slightly closer to us than the other two stars in the group. This space trivia question trips up even people who own telescopes.

11. Roughly how many stars are in the Milky Way galaxy? (Medium)

Answer: Between 200 billion and 400 billion. The exact count varies by estimation method.

Why it stumps people: Most guesses land at “millions” or “a few billion.” The real number is hundreds of billions, and the Milky Way isn’t even a large galaxy. Andromeda, our nearest spiral neighbor, has about a trillion stars.

Here’s where space trivia gets humbling.

The Sun is enormous compared to Earth. UY Scuti makes the Sun look like a grain of sand.

12. When two galaxies collide, do the stars inside them crash into each other? (Hard)

Answer: Almost never. Galaxies are mostly empty space. The average distance between stars is so vast that during a collision, stars pass right through without touching. But gravity reshapes both galaxies dramatically.

Why it stumps people: “Collision” implies smashing. And the Milky Way is on a collision course with Andromeda (expected in about 4.5 billion years). But if you were living on a planet during a galactic merger, you likely wouldn’t notice anything for millions of years.

13. How much would a teaspoon of neutron star material weigh on Earth? (Hard)

Answer: About 6 billion tons. A neutron star packs the mass of 1.4 to 2 Suns into a sphere roughly 20 kilometers across.

Why it stumps people: The number sounds made up. It isn’t. When a massive star collapses, protons and electrons fuse into neutrons, eliminating nearly all empty space between particles. The result is the densest material in the known universe, short of a black hole.

14. How fast is the Sun moving through the Milky Way? (Medium)

Answer: About 828,000 kilometers per hour (515,000 mph), orbiting the galactic center. One full orbit takes roughly 225 to 250 million years, sometimes called a “galactic year.”

Why it stumps people: Simple question. Sneaky answer. Most people don’t realize the Sun moves at all. It feels stationary because everything in our neighborhood moves with it. But relative to the galactic center, the entire solar system is screaming through space at more than twice the speed the Parker Solar Probe reaches.

What does that look like in practice?

The Moon & Earth from Space (15-21)

Space trivia questions about the Moon on LearnClash cover the object humans know best and still get wrong. The Moon is close, well-studied, and packed with details that contradict what most people were taught in school. Or what they picked up from movies.

Four Moon myths that almost everyone believes. All four are wrong.

15. Can you see the Great Wall of China from space with the naked eye? (Easy)

Answer: No. The Wall is long but only about 4.5 to 9 meters wide. From low Earth orbit, that’s far too narrow to resolve without a camera with a zoom lens.

Why it stumps people: This myth has been repeated in textbooks for decades. Even some Chinese textbooks included it. But multiple astronauts, including Yang Liwei (China’s first astronaut), confirmed they couldn’t see it. You can see cities, highways, airports, and the Pyramids of Giza.

16. Does the far side of the Moon ever receive sunlight? (Easy)

Answer: Yes, just as much as the near side. The “far side” is the half that always faces away from Earth. But it gets a full two weeks of sunlight during each lunar cycle, just like the near side.

Why it stumps people: Hollywood is to blame for this one. The phrase “dark side of the Moon” made people think it’s literally dark. The correct term is “far side.” It’s unknown, not unlit.

17. Does the Moon experience earthquakes? (Medium)

Answer: Yes. They’re called moonquakes. Apollo astronauts placed seismometers on the surface between 1969 and 1972, and those instruments detected thousands of seismic events.

Why it stumps people: People assume you need plate tectonics for quakes. The Moon doesn’t have active plates, but it does experience four types of moonquakes: deep (tidal stress), shallow (possibly tectonic), thermal (surface expansion from sunlight), and impact-triggered. This is the space trivia question that makes geologists smile.

Did you know? LearnClash’s Moon topic has some of the highest miss rates of any space category. Players are overconfident about facts they learned in primary school, which makes the correction stick through spaced repetition.

18. How old is the Moon? (Medium)

Answer: About 4.5 billion years old, nearly the same age as Earth. The leading theory is that a Mars-sized body called Theia slammed into early Earth, and the debris coalesced into the Moon.

Why it stumps people: Most guesses land at “a few billion years” without specifics. The surprise is that the Moon is essentially the same age as Earth, which supports the giant impact hypothesis. Lunar rock samples brought back by Apollo missions confirmed the age through radiometric dating.

The Moon drifts 3.8 cm farther from Earth every year. In 600 million years, total solar eclipses will no longer be possible.

19. How fast is the Moon moving away from Earth? (Medium)

Answer: About 3.8 centimeters per year, roughly the rate your fingernails grow. Apollo astronauts left retroreflectors on the surface, and scientists bounce lasers off them to measure the distance precisely.

Why it stumps people: The drift rate sounds trivial. And it is, on human timescales. But over hundreds of millions of years, it adds up. About 620 million years from now, the Moon will be too far away for total solar eclipses to occur.

20. What primarily causes ocean tides on Earth? (Hard)

Answer: The Moon’s gravitational pull, not the Sun’s. The Moon accounts for about 68 percent of tidal force. The Sun contributes the remaining 32 percent, which is why tides are strongest during full and new moons when both align.

Why it stumps people: The catch is that most people know both the Moon and Sun are involved but can’t say which dominates. Some guess the Sun because it’s more massive. But tidal force depends on distance more than mass, and the Moon is about 390 times closer than the Sun.

21. How long will footprints left on the Moon last? (Hard)

Answer: Potentially millions of years. The Moon has no atmosphere, no wind, no rain, and no plate tectonics. The only erosion comes from micrometeorite impacts and solar wind, both extremely slow processes.

Why it stumps people: On Earth, a footprint in sand disappears in minutes. The idea that a boot print could outlast entire civilizations feels wrong. But Neil Armstrong’s first footprint from 1969 looks the same today as it did then.

And that changes everything about how we think of preservation.

Space Exploration & NASA Missions (22-28)

Space trivia questions about NASA on LearnClash span the full history of spaceflight, from captured V-2 rockets to probes that won’t reach their next destination for 40,000 years. The records here keep getting broken, and the forgotten firsts are often more surprising than the famous ones.

Seven decades of space exploration, from fruit flies to the fastest object humans have ever built.

22. What were the first animals sent into space? (Medium)

Answer: Fruit flies, launched aboard a U.S. V-2 rocket on February 20, 1947 from White Sands, New Mexico. They reached 109 kilometers altitude and were recovered alive.

Why it stumps people: Nearly everyone says Laika the dog. Laika orbited Earth in 1957, a full decade later. The fruit fly mission tested the effects of cosmic radiation at high altitude. The flies returned unharmed, paving the way for every animal and human launch that followed.

This is the space trivia answer that gets the most pushback.

23. How many people have walked on the Moon? (Medium)

Answer: 12. All American. All men. All between 1969 and 1972 across six Apollo missions (11, 12, 14, 15, 16, and 17).

Why it stumps people: Apollo 13 is the most famous mission, but nobody walked on the Moon during it (the crew barely made it home). And most people guess fewer than 12 because they only remember Armstrong and Aldrin.

24. Which human-made object is farthest from Earth? (Medium)

Answer: Voyager 1, currently about 16 billion miles (25.8 billion km) from Earth. In November 2026, it will cross the one-light-day milestone, meaning radio signals will take a full 24 hours to reach it.

Why it stumps people: Voyager 2 is a common wrong answer. Both probes launched in 1977, but Voyager 1 took a shorter route and pulled ahead. It crossed into interstellar space in 2012 and is still transmitting data.

Did you know? Both Voyager probes carry a Golden Record containing sounds and images from Earth, including music by Bach, Chuck Berry, and traditional songs from around the world. The instructions for playing it are etched on the cover in symbolic language.

25. How many golf balls are on the Moon? (Medium)

Answer: Two. Alan Shepard hit them during the Apollo 14 mission in February 1971 using a modified 6-iron head attached to a sample collection tool.

Why it stumps people: Sounds right. Isn’t. Most people either don’t know about the golf shots at all, or they guess one ball. Shepard hit two: the first was a shanked dribble, the second flew what he claimed was “miles and miles.” In the low lunar gravity, it probably traveled 200 to 400 yards.

Space exploration’s weirdest records. Two golf balls, 16 sunrises a day, and a probe faster than anything humans have ever built.

26. How often does the International Space Station orbit Earth? (Easy)

Answer: Every 90 minutes. That means ISS astronauts see 16 sunrises and 16 sunsets every day.

Why it stumps people: The number is surprisingly fast. The ISS orbits at about 28,000 km/h at an altitude of roughly 400 km. Most people guess once a day or once every few hours.

27. What is the fastest human-made object ever? (Hard)

Answer: The Parker Solar Probe, reaching 430,000 mph (690,000 km/h) during its closest passes to the Sun. That’s 0.064 percent the speed of light.

Why it stumps people: Voyager 1 is a common guess because it’s the farthest away. But Voyager travels at a comparatively slow 38,000 mph. The Parker probe’s speed comes from using Venus gravity assists to swing closer and closer to the Sun, converting gravitational potential energy into velocity.

28. Which NASA Mars rover carried a helicopter? (Hard)

Answer: Perseverance, which landed on Mars in February 2021 carrying the Ingenuity helicopter. Ingenuity completed 72 flights before its mission ended in January 2024.

Why it stumps people: The rover’s name often gets confused with Curiosity (which landed in 2012) or Opportunity (which lasted from 2004 to 2018). And the fact that a helicopter flew on Mars still sounds like fiction. Mars has less than 1 percent of Earth’s atmospheric density.

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Think about it this way.

Black Holes & Cosmic Phenomena (29-35)

Space trivia questions about black holes and cosmic phenomena on LearnClash test the hardest material in this collection. These questions require you to think at scales where normal physics breaks down, time bends, and 95 percent of the universe is made of stuff nobody can directly observe.

Everything you can see, touch, or detect makes up just 5 percent of the universe.

29. What sits at the center of the Milky Way galaxy? (Medium)

Answer: A supermassive black hole called Sagittarius A* (pronounced “A-star”), with a mass of about 4 million times our Sun.

Why it stumps people: Many people know a black hole is involved but can’t name it. Sagittarius A* was directly imaged for the first time in 2022 by the Event Horizon Telescope, confirming decades of indirect evidence.

30. What happens to time near a black hole? (Medium)

Answer: Time slows down. The closer you get to a black hole’s event horizon, the slower time passes for you relative to someone far away. This is called gravitational time dilation, predicted by Einstein’s general relativity.

Why it stumps people: The film Interstellar showed this accurately. One hour near a black hole equaled seven years on the ship. But most people think it was dramatized. It wasn’t. GPS satellites already correct for time dilation caused by Earth’s gravity, which is a tiny fraction of what a black hole produces.

31. What percentage of the universe is made of visible matter? (Hard)

Answer: About 5 percent. Dark energy makes up roughly 68 percent. Dark matter accounts for about 27 percent. Everything you can see, every star, planet, and galaxy, is a small fraction of what exists.

Why it stumps people: The name “dark matter” sounds theoretical. It isn’t. Its gravitational effects are measurable in galaxy rotation curves, gravitational lensing, and the cosmic microwave background. We can see what it does. We just don’t know what it is.

Now for the hardest space trivia in this collection.

Cosmic numbers that are hard to process. A supernova briefly outshines 10 billion stars.

32. What is the cosmic microwave background? (Hard)

Answer: The afterglow radiation from the Big Bang, released roughly 380,000 years after the universe formed, when it cooled enough for atoms to form and photons to travel freely.

Why it stumps people: The name gives nothing away. “Cosmic microwave background” sounds technical and abstract. But it’s literally the oldest light in the universe. It fills all of space and was accidentally discovered in 1965 by Arno Penzias and Robert Wilson, who initially thought their antenna had a pigeon problem.

33. What is the exact speed of light in a vacuum? (Hard)

Answer: Exactly 299,792,458 meters per second. Not approximately. Since 1983, the meter itself has been defined by the speed of light, which means this number is exact by definition.

Why it stumps people: Most people say “300,000 km/s” or “186,000 miles per second,” both good estimates. The surprise is that the number isn’t rounded. It’s the definitional anchor of the metric system.

34. How bright can a supernova get? (Medium)

Answer: A supernova can briefly outshine its entire host galaxy, producing the light output of 10 billion Suns at peak brightness. Some supernovae have been visible to the naked eye from Earth in broad daylight.

Why it stumps people: “Brighter than a galaxy” sounds impossible. But Supernova 1006, visible in 1006 AD, was bright enough to cast shadows at night and was recorded by observers in China, Egypt, Japan, and Europe. The energy released in a few weeks exceeds what our Sun will emit in its entire 10-billion-year lifetime.

35. What is the event horizon of a black hole? (Medium)

Answer: The boundary around a black hole beyond which nothing, not even light, can escape. It isn’t a physical surface. It’s a mathematical boundary defined by the escape velocity reaching the speed of light.

Why it stumps people: Many picture a hard shell or a visible edge. The event horizon is invisible. You could cross it without noticing, at least for a supermassive black hole. For smaller black holes, tidal forces would stretch you apart (called “spaghettification”) well before you reached it.

Challenge a friend to black holes trivia →

The results surprised us.

Space Misconceptions That Fool Everyone (36-42)

Space trivia questions about misconceptions on LearnClash have the highest miss rates of any category. These aren’t obscure facts. They’re things most educated adults believe they know. And every single one is wrong.

This is where the testing effect hits hardest. Getting a confident answer corrected sticks in memory far better than passively reading the right answer.

Seven things almost everyone believes about space. All seven are wrong.

36. Is there sound in outer space? (Medium)

Answer: No. Sound requires a medium (air, water, solid matter) to travel through. Space is a near-vacuum with too few particles to carry sound waves.

Why it stumps people: Every space movie gets this wrong. Explosions, engine roars, laser blasts. In reality, the vacuum of space is completely silent. Astronauts on spacewalks communicate only through radio.

37. Are astronauts on the ISS floating in “zero gravity”? (Medium)

Answer: No. Gravity at the ISS altitude (about 400 km) is roughly 90 percent as strong as on Earth’s surface. Astronauts float because they’re in continuous freefall around the Earth, not because gravity disappears.

Why it stumps people: “Zero gravity” is one of the most repeated phrases in space coverage. The correct term is “microgravity.” The ISS and everyone inside it are falling toward Earth constantly but moving sideways fast enough to keep missing it. That’s what an orbit is.

38. What color is the Sun when viewed from space? (Hard)

Answer: White. Earth’s atmosphere scatters shorter blue wavelengths (Rayleigh scattering), making the sky blue and the Sun appear yellow or orange to us on the surface. From space, with no atmospheric filter, the Sun emits roughly equal intensity across all visible wavelengths, which our eyes perceive as white.

Why it stumps people: Every children’s drawing, every sunrise photo, every emoji confirms the lie. A yellow Sun. Sunrise photos show an orange Sun. But astronaut photographs from the ISS consistently show a brilliant white star.

Key takeaway: The color we see depends entirely on where we’re standing. LearnClash space misconceptions questions have a 34 percent accuracy rate on first attempt, the lowest of any space category.

39. Is the asteroid belt between Mars and Jupiter densely packed with rocks? (Hard)

Answer: No. The average distance between objects in the asteroid belt is about 960,000 kilometers (600,000 miles), more than twice the distance from Earth to the Moon. A spacecraft can fly straight through without any risk of collision.

Why it stumps people: Star Wars and The Empire Strikes Back showed the Millennium Falcon dodging asteroids every few meters. In reality, every probe that has crossed the asteroid belt (Pioneer 10 and 11, Voyager 1 and 2, New Horizons, Juno, and others) did so without any special maneuvering.

40. Would you freeze instantly if exposed to the vacuum of space? (Hard)

Answer: No. Space is a near-vacuum, and vacuum is actually a terrible conductor of heat. You’d lose heat slowly through radiation, not conduction. The more immediate dangers are unconsciousness within 15 seconds (from lack of oxygen), boiling saliva (from the pressure drop), and severe sunburn from unfiltered UV radiation.

Why it stumps people: Movies show instant freezing because it looks dramatic. The truth is less cinematic. NASA studies estimate you could survive about 90 seconds of vacuum exposure and recover fully if repressurized in time.

41. Can astronauts cry in space? (Medium)

Answer: Yes, but the tears don’t fall. Without gravity to pull them down, tears form a growing ball of liquid that pools around the eyes. Canadian astronaut Chris Hadfield demonstrated this on the ISS and described it as “stinging” because the water doesn’t drain away.

Why it stumps people: Nobody thinks about the mechanics of crying in microgravity until they hear it. It’s one of those details that makes orbital life feel completely alien despite being entirely explainable by basic physics.

42. Is Pluto a planet? (Medium)

Answer: No, at least not by the International Astronomical Union’s 2006 definition. Pluto is classified as a dwarf planet because it hasn’t “cleared the neighborhood” of its orbit. Its orbital zone overlaps with thousands of other Kuiper Belt objects.

Why it stumps people: Generational muscle memory. Anyone educated before 2006 learned nine planets. The reclassification was controversial, and NASA’s New Horizons mission in 2015 showed Pluto has mountains, glaciers, and a thin atmosphere, which made many people argue it deserves planet status. The debate isn’t over.

How to Use These Space Trivia Questions

These 42 space trivia questions work for trivia night at a bar, a classroom warm-up, a family game night, or testing yourself before bed. Group them by section for themed rounds, or shuffle them for a harder challenge.

“Retrieval practice produces more learning than elaborative studying with concept mapping.” Karpicke & Blunt (2011), Science

That’s the research behind why answering space trivia questions beats rereading a textbook. For a full experience with scoring, ranking, and spaced repetition that tracks what you miss, try a space duel on LearnClash. Every wrong answer comes back at the right time until you master it. That’s the difference between playing trivia and actually learning from it, backed by the same testing effect research used in Roediger & Butler’s landmark retrieval practice studies.

The numbers that define space. Most of them feel wrong. All of them are right.

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